Bad Firefox integration with dark themes

Bug #220263 reported by Luca Livraghi on 2008-04-21
This bug affects 6 people
Affects Status Importance Assigned to Milestone
Mozilla Firefox
Fix Released
firefox (Ubuntu)

Bug Description

I'm using Mozilla Firefox 3 Beta 5 on Ubuntu 8.04 with a dark theme. Now I see all the input boxes and buttons filled with grey colour. This happened even with Firefox 2, but I solved that problem with a quick guide under the comment "firefox fix" by Proton at the bottom of this page:

In Firefox 3 I can't correct this problem.

Chaning the qa contact on these bugs to me. MPT will be moving to the
owner of this component shortly. I would like to thank him for all his hard
work as he moves roles in, Yada, Yada...

In , Asa (asa) wrote :

updating to new owner. sorry for the spam.

Using build 2001030812, text in menus is now white, text in boxes is still black
on black background. Also this bug may be related to bug 67448.

What's the name of the GTK theme you use where you see the problems?

Any theme with a dark background and white text will do.

Well, I'm trying to attach it, but bugzilla keeps timing out. The theme I'm
using is called Darkalloy. Some you might find on are Absolute-E,

I've experimented a little with what we could do to fix this. If I change the
two places where we used the |text| color (WindowText and an equivalent non-CSS
color type) to use the |fg| color, then Darkmarble improves significantly, but
it huts some other themes including LCARS (a dark theme where the default text
|fg| color is the same as the default button background) and Metal (where the
default text |fg| color is not really intended to be used for significant chunks
of text. (That's generally the problem, I think -- that the |fg| color is made
to be used for bits of UI, but not the large chunks of text that it's used for
in "Use System Colors".)

I think part of the problem is coming from our system color use conventions:
 * there are places where -moz-field is used as a background, and it doesn't
have a matching foreground color
 * there are places where text that is not ButtonText colored is used on a
ThreeDFace background. (In the Windows system colors, ThreeDFace was defined
to be equivalent to ButtonFace -- the ThreeD* colors were added in Windows 95
when buttons went from a single-border raised appearance to a double-border
raised appearance. Is it a bug that we use the ThreeDFace color as a
background on things other than buttons?)

The following patch is arguably correct, and it improves the situation in the
DarkMarble theme, but makes it worse in Metal (because it's using a color that
was intended for labels rather than large chunks of text) and LCARS (because we
use WindowText on a ThreeDFace background).

I think if we really want to fix this we need to change some of the ways system
colors are used in the Classic skin. To do this, it would be helpful to
understand exactly what some of the system colors (e.g., WindowText,
AppWorkSpace, etc) mean in Windows (since that's where they came from, and the
CSS definitions aren't too informative).

Index: nsLookAndFeel.cpp
RCS file: /cvsroot/mozilla/widget/src/gtk/nsLookAndFeel.cpp,v
retrieving revision 1.49
diff -u -d -r1.49 nsLookAndFeel.cpp
--- nsLookAndFeel.cpp 2001/03/10 03:17:07 1.49
+++ nsLookAndFeel.cpp 2001/03/10 04:08:04
@@ -224,7 +226,7 @@

   case eColor_windowtext:
- aColor = GDK_COLOR_TO_NS_RGB(mStyle->text[GTK_STATE_NORMAL]);

   // from the CSS3 working draft (not yet finalized)

Just so everyone knows, text boxes are still completely unreadable in many GTK
themes, and 8.1 will be out in a few days.

Should I back out all my changes for bug 67448? The above patch would be
part of such a backout, and wouldn't be such a problem with LCARS if we're
not getting real button colors. Or maybe I should just check that in and
fix many themes at the expense of LCARS and any other themes where the
button colors don't match the window colors?

Well, the only places I see a problem right now is the text boxes and text
lables in the personal toolbar. If these can be reverted to the way it was
before with your one-line patch, I say go for it. If it messes colors up in
other themes, then perhaps it's better to back the whole thing out until we can
do it a way that is "right" for all cases.

--> Themes. Coming up with a -moz-CSS set of sane and cross-platform UI colors
is an idea which seems more attractive by the minute.

In , P-ch (p-ch) wrote :

isn't that fixed? at least, with FB gtk2 it is.

I'm still suffering from this bug on sites which use CSS to set the foreground colour in buttons and text entry widgets, but continue to inherit my gtk background colour. See, eg (though I've asked them to add a background colour to their style sheets; I'll post the next example I come across). The gtk theme is at

What I'd really like to know: is there a way to make mozilla completely ignore the gtk theme? It's a bit silly to just take the buttons and text entry box colours out of context anyway.

Created attachment 293394
Downloads info is unreadable

This bug still exists. Attaching 2 examples. These were taken with:

Build identifier: Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-US; rv:1.9b2) Gecko/2007121016 Firefox/3.0b2

on Fedora 8 with jimmac's Darkilouche gtk theme.

Created attachment 293395
URL dropdown with almos unreadable text

See above.

What's this bug status regarding the Firefox 3 release?

Is this really that difficult to fix? I'd be willing to work on a patch if there is a chance to get this into Firefox 3

Created attachment 312077
The awesomebar with the darkilouche theme...

The green urls are almost unreadable...

Created attachment 312080
The website identification box with the darkilouche theme.

Another situation where using a dark theme (GTK darkilouche) leads to unreadable text.

Luca Livraghi (luca91) wrote :

I'm using Mozilla Firefox 3 Beta 5 on Ubuntu 8.04 with a dark theme. Now I see all the input boxes and buttons filled with grey colour.

You can see it: 1)

This happened even with Firefox 2, but I solved that problem with a quick guide under the comment "firefox fix" by Proton at the bottom of this page:

In Firefox 3 I can't correct this problem.

Alexander Sack (asac) wrote :

can you please upload those images to launchpad as attachment to this bug?

Changed in firefox:
status: New → Incomplete
Luca Livraghi (luca91) wrote :
Luca Livraghi (luca91) wrote :
description: updated
Christophe Olinger (olingerc) wrote :

Hmm, I also use a dark theme, but do not have this problem.

Here an attachment of my firefox and of my system colors settings.

Christophe Olinger (olingerc) wrote :
Luca Livraghi (luca91) wrote :

Interesting, so you have buttons and input boxes filled with dark colours too. But you have the white letters in the boxes, I have grey buttons and black letters.

Lutz (webmaster-phatsonic) wrote :

> I have grey buttons and black letters.

You think that's bad? I have black letters on black background for some sites and white on white for others... ;)

First things first:
- Hardy
- Compiz and Emerald
- Themes: "aud-Default" (Metacity) and "Enduro Black" (Emerald)
- Firefox 3.0b5 (Mozilla/5.0 (X11; U; Linux i686; de; rv:1.9b5) Gecko/2008041514 Firefox/3.0b5 ID:2008041514)

I tried to just overwrite the themes colors in firefox, but it didn't work, although it should.
I made a file "~/.mozilla/firefox/MY_PROFILE_FOLDER/chrome/userContent.css" with this content:

input, textarea, checkbox, select, option {
 background:#FFFFFF none no-repeat;
 background-color: #FFFFFF;
 color: #000000;
button, input[type=button], input[type=submit], input[type=reset], input[type=file] {
 background:#FFFFFF none no-repeat;
 background-color: grey;
 color: #000000;

Firebug showed me that the styles where used, but the input fields where still black on black.
BAD bug. The OS theme has to respect the firefox settings!

Next try:
Using the Web Developer Toolbar function "Add User Stylesheet". And here it gets strange: That worked perfectly!
The forms were usable and colored like I specified in the css file.

So it definitly seems to be a firefox-related bug. It's either a bug in FF3b5 or the Ubuntu integration fucked up somewhere along the road.

My short term solution: Having the css ready and use Web Developer Toolbar to repair non-working forms (like this one btw).
(And telling as many webdesigners as possible to fucking specify the colors they want on their sites. I really thought most people knew that by now.)

But that has to change pretty fast:
- Tools like Firebug (which I NEED for my job) don't really work in Beta5. (I made it "kinda" work, but it's next to impossible to use in the current state)
- Reinstalling FF2 didn't work on Hardy (couldn't find out why yet)
- And my Theme (which I can't change to a bright one without editing the configs for many apps that I changed to be white-on-black compatible) screws up many websites

I think I'm going on a vacation for a few weeks... ;)

Lutz (webmaster-phatsonic) wrote :

Just a quick follow-up:

I reinstalled FF2 on Hardy - everything else stayed the same.

Here the fix I mentioned above (css file in "~/.mozilla/firefox/MY_PROFILE_FOLDER/chrome/userContent.css") works.
So the bug only appears in the FF3 beta.

I have a real problem here, if you want to reproduce this bug:

Download a dark theme:

FF3 Beta tries to use the colors but text boxes foreground is not changed while background is. Attached is a screenshot of my current screen.

Luca Livraghi (luca91) on 2008-05-17
Changed in firefox-3.0:
status: Incomplete → Confirmed
Luca Livraghi (luca91) wrote :

That's it, this is the bug.
All you can do, it's click to System->Preferences->Themes->Customize and under the tab "colours", click on the left "input boxes" button and use this colour: #4A4A4A. You have the same problem, but with this trick the input boxes are clearer. In the other hand, we have to wait a fix of this bug (if there will be one).

John Vivirito (gnomefreak) wrote :

Alexander are you able to confirm this issue? I am unable to after trying the themes it works ok here, As i recall Firefox-3 was handling themes differently right that is why we no longer have theme package for 3.0? I will leave confirmed on that request for info.

Joe appears to be "gone"... flipping assignment to default again.

not sure if its still the same bug, but linking ubuntu bug ("Bad Firefox integration with dark themes") to this one.

Alexander Sack (asac) wrote :

OK, I set the proper upstream bug. Its rather old, but since it hasnt been really active we can probably high-jack it. Please continue discussion there.

Changed in firefox-3.0:
importance: Undecided → Medium
status: Confirmed → Triaged
Changed in xulrunner:
status: Unknown → Confirmed
In , Phiw (phiw) wrote :

Created attachment 323840
test case

(these assume default theme at both browser and OS level - black text, white background).

1. load testcase
2. open Preferences > Content > Colors
3. adjust your colours: set dark/black background, light/white 'text' colour.
4. uncheck the 'Allow pages to choose their own colors...'

Actual result: watch the second row of form controls: the text in the form controls doesn't change colour (remains the default OS 'Text' colour)
Expected result: the text-colour in the styled form controls changes to the one specified in step 3 above.

Regression from FX 2. I suspect this regressed from bug 58048, but I haven't checked this yet

(Via the forums:

In , Phiw (phiw) wrote :

Created attachment 323841

What I see on OS X - default settings, with the colour/background changes as indicated.

That is with
Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.1a1pre) Gecko/2008060417 Minefield/3.1a1pre

Camino trunk builds and WinXP FX 3 RC2 show the same

In , Kliu (kliu) wrote :

*** Bug 437392 has been marked as a duplicate of this bug. ***

In , Kliu (kliu) wrote :

A bit of searching turned up bug 419140 and bug 405207. Those were about changing the system color scheme, while this is about changing the browser color scheme, but the underlying problem may be the same...

Changed in firefox:
status: Unknown → Confirmed
Changed in firefox:
status: Confirmed → Fix Released
Changed in firefox:
status: Fix Released → Confirmed
Changed in firefox:
status: Confirmed → Fix Released
Changed in xulrunner:
importance: Unknown → Medium
Changed in firefox:
importance: Unknown → High
affects: firefox-3.0 (Ubuntu) → firefox (Ubuntu)
Adolfo Jayme (fitojb) on 2013-02-20
Changed in firefox (Ubuntu):
importance: Medium → Low
58 comments hidden view all 138 comments

I too am also affected by this (seemingly old) bug, on an Ubuntu Gnome 15.04 using the built-in dark theme. Some text boxes result in using white text on a white background, since Firefox uses a mixture of the webpage CSS and that from the GNOME theme.

Dario's suggestion above is sensible, since webpages were meant to look the same, regardless of OS/System/Theme.

As Dario said, it doesn't make sense to use the GTK theme on web pages. In addition to this, there is *already* a setting for not using the system colours:

Edit > Preferences > Colors > Use system colors

I believe it is off by default and obviously should prevent the system colour scheme from determining form field background colours, but it doesn't.

Seems to be the same issue as in bug 519763, similarly disappointing progress there as well though.

For what it's worth, there is a very clean workaround in the ArchWiki:

I had seen some other userContent.css "fixes" that didn't get everything or overrode too much, breaking legit stylesheets, but this seems to only override the default and shouldn't override any actual website css.

I've tried that work around on form fields on my bank account, and they don't work. Actually GnomishDark theme also provides several recommendations under:


Which mozilla ones are almost the same suggested by the Arch workaround, and I've also been using for quite a while now.

They don't work with FF 45.0.1 and gtk+3 3.20.2 setting gtk+3 to prefer applications' dark themes and to use the dark theme GnomishDark.

However it doesn't work on nvidia graphics, but seems to be working on intel graphics with the same settings...

Though my problem is different though, the backgorund is white and the font is white as well

The fact that Firefox cannot handle dark desktop themes was reported many times FOR SEVENTEEN YEARS.

Seventeen years. And still an issue.

Webpages display partly in system colors causing white on white or black on black text/form elements, while parts of the Firefox UI defy every dark theme and stay eye-bruning white.

I hoped that finally Quantum will fix this... but it MADE IT WORSE!

Now several parts of the FF GUI have white on white checkboxes or disabled text, and everything in settings is blazing white as well as new tab page.

All you need to do to fix the websites is to use the widespread defaults instead of system colors to render webpages.



But you can't do this for 17 years for reasons beyond comprehension.

WORKS in Internet Explorer
WORKS in Microsoft Edge
WORKS in pretty much EVERYTHING other than Firefox.

Just a few tickets about problems with dark themes, in order: <--- 17 years old report!!! Still "New"!

Dear Storm,

1. Putting same heated rant in multiple bugs is one good way to achieve two things: a) earn a ban from commenting on this Bugzilla, and b) decrease the likelihood of these bugs being fixed by blurring their scope. I mean, it's surely the easy thing to do, whereas a much more constructive and useful thing would be to figure out which of these issues are duplicates of each other, or have lost focus over time, and propose merging or closing them. For example, this bug seems to have become a catch-all for anything dark_theme-related, and IMO is as good as closed by now anyways, whereas bug 119538 is actually about Firefox for Android, which is a separate product, has nothing to do with GTK, and is irrelevant in any discussion where particular issues on GTK, Windows or Mac are involved. Similarly, bug 1425517 is about Calendar (built-in Thunderbird extension), and as such has very little relevance to Firefox.

Another good thing to do would be to file new bugs if you stumble upon issues which aren't on the record yet. The narrower the issue, the more chance you have of it being taken seriously and fixed. You know, because fixing "OMG NOTHING WORKS YOU ALL SUCK" is kinda more difficult than fixing "Checkboxes in this particular dialog are illegible when using dark theme, here's a screenshot and more info".

Oh, and of course, you could have proposed a patch instead of complaining.

2. Content colors are user-managed, and default to black-on-white: The option to "Use system colors" is NOT checked by default, and it has always been this way.

3. On the other hand, form fields have always inherited the system-wide look by default. Mozilla even has it documented:

3. Illegible text, whether in form fields or elsewhere, is pretty much ALWAYS the designer's (or rather person's who did the CSS work) fault. It's a rule of thumb that if you're specifying background color, you should also specify text color, and vice-versa. Back in the day, people used to validate their CSS, and specifying just one of those colors would trigger a warning in the validator. Nowadays, everyone just blindly assumes that stuff will work after minimum testing on Chrome, and then blames whatever doesn't work in the other browser on that other browser.

Now, aside from all that, I suppose a desire to use back-on-white on form widgets by default (so long as "use system colors" is unchecked) could be a valid feature request. I doubt this would be easy to implement though, especially assuming that some people might prefer native look.

Download full text (3.8 KiB)

Dear Rimas Kudelis,

Let me answer each of your points. I'll leave point 1; to the last

> 2. Content colors are user-managed, and default to black-on-white:
> use#w_change-font-color.

FALSE. Those colors have _nothing_ to do with default colors. They are override colors, that, when apply, override websites' CSS as well. By default they only apply with HighContrast theme, and no, "use system colors" is NOT enabled on my FF.

I just set those colors to bright red and neon green - guess what? Writing a review on is _still_ light gray on white. And that light gray is my system color, which shouldn't apply, yet it does.

Ever since I use Firefox with a dark theme (about 10+ years) this was broken. And currently there is no any way I know of, or that I could find via hours of Googling, to change the default colors Firefox falls back to if no color is specified.

> 3. On the other hand, form fields have always inherited the system-wide look
> by default.

And they shouldn't. Appearance, sure, but NOT colors. Colors of the host system should not, ever, under any circumstance affect the colors displayed in webpages, since webpages' look is independent of the host system.

> 3. Illegible text, whether in form fields or elsewhere, is pretty much
> ALWAYS the designer's (or rather person's who did the CSS work) fault.

I disagree partly. It is their fault that they didn't specify colors, and relying on the assumption that if no color is specified then background will be white and text will be black.

But it is not their fault, that this assumption is true in every single browser, except Firefox with dark theme. It is also not their fault, that Firefox, instead of implementing these common expectations as default, lets system colors bleed into webpages. And since we know that many-many webdesigners will be lazy, why not save our users from all that pain by implementing sane defaults?

Also, it's funny how parts of are affected by this issue.

> Back in the day, people used to validate their CSS
And in a perfect world they would still do it, but we are not living in a perfect world sadly, so we may as well account for that instead of sticking heads into the sand.

> Nowadays, everyone just blindly assumes that stuff will
> work after minimum testing on Chrome
If they don't have a dark system theme, it will work for them in every single browser in existence. Only Firefox, combined with dark system theme does break it.

So back to 1;

I'm desperate. I started using Firefox about 15 years ago because it was the best, and_most_customizable_ browser out there. It had its flaws, but we loved it regardless.

I had high hopes for Quantum, but instead it was a gigantic let down.
 - It killed off several amazing Addons, that are impossible to port to WebExtension because it's extremely limited.
 - Addon devs' feature requests for functionality allowing said mods to be ported were simply closed with "WONTFIX".
 - Even more customization was removed, partly by making it impossible for Addons to customize FF now (eg. Classic Theme Restorer with millions of user...


I wholly agree with Storm's assessment. As a programmer, a web developer, and a UI designer, the fact that Firefox has sat on this bug for over a decade is shameful, especially since it has been *patched* with extensions before.

For anyone affected, install the "Text Contrast for Dark Themes" ( extension. I've been using it for the past few weeks, and it resolves 98% of the problems related to this bug.

The fact that extension exists should NOT be taken as an excuse for Firefox not to fix this. If anything, it means that Firefox developers have even *less* excuse for taking care of the problem, since the patch code is in the extension!

Please, Firefox devs, fix this! With the rise of themes like Arc-dark, this is a HUGE issue! I just want things to look normal! Is that so much to ask?

*begging puppy eyes*

Yeah pretty weird this is still an issue, should be pretty easy to fix. In the mean time. Meanwhile, this fixed my problem:

(backup your profile, then place the userContent.css file in your ~/.mozille/firefox/XXXXXXXX.default/chrome directory - create it if it doesn't exist)

(In reply to vaaghoofdharry from comment #39)
> Yeah pretty weird this is still an issue, should be pretty easy to fix. In
> the mean time. Meanwhile, this fixed my problem:
> (backup your profile, then place the userContent.css file in your
> ~/.mozille/firefox/XXXXXXXX.default/chrome directory - create it if it
> doesn't exist)

This is a major improvement already and can also be used in Thunderbird.
The directory (on Ubuntu) is ~/.thunderbird/XXXXXXX.default/chrome, which didn't exist initially.

Would like to see a built-in complete solution to this for both Firefox and Thunderbird.

Just want to confirm that this bug is still NOT fixed. I use KDE Plasma desktop enviroment with Breeze Dark color scheme. Usually I use Chromium, sometimes Google Chrome, as they don't have issues with dark themes. But I want to use Firefox and because of this bug I can't. I was following Firefox releases past 4-5 years expecting to see a fix for this.

Now I use "Text Contrast for Dark Themes" extension which kind of helps, but not enough for daily use.

It's sad to see that this bug already 17 years old and does not get enough attention to get fixed.

As dark themes for GTK+ getting more popular, I hope to see a fix in future. Could be set as a milestone for 2020 or something, that would be really great! No other browser has this issue, only Firefox.

If this is super hard to fix, maybe would be good idea to switch to another toolkit instead of GTK+? For example Qt toolkit is very good, has a lot of support and works pretty well.

OFFTOPIC: One thing made me happy with recent Firefox releases, that HighDPi display support is improved, and it's possible to get non-integer value scaling of UI and websites. For that I was waiting 2 years and I am really happy it got improved. To get Dark Theme compatibility would be last step to make Firefox usable for me and some other users!

Still not fixed, what an annoying bug


i can't believe a small nuisance is taking 17 years not fixed.


I suspect that many aspects of this actually were fixed at various times. But the hard part is to prevent all the CSS changes in the browser front-end from triggering some aspect of it again. (At one point I think I'd made a testing mode in which the correct foreground/background pairs were always the same color, so that no text should be visible, that could be used to check that colors were matched correctly. I'm not sure if I even landed the code for it or what happened to it since.) I'd also done some work to document what those pairs were, i.e., the rules for which native-theme-derived foreground color should be matched with which background color so that themes work correctly. (-moz-appearance makes this a bit more complicated, since foreground colors could be matched with a -moz-appearance background as well.)

The number of comments recently makes me suspect that something got *worse* recently.

In theory fixing this probably requires:
 * documenting what the valid foreground-color and (background-color or -moz-appearance) pairs are for use of colors from native themes
 * developing a mechanism to check that the UI uses only those pairs together and nothing else (probably by making each pair render the same (bright) color as a diagnostic
 * auditing the Firefox UI
 * checking that the things we're extracting from GTK themes make sense with the rules that we're applying

(In reply to David Baron :dbaron: ⌚UTC+2 from comment #45)
> The number of comments recently makes me suspect that something got *worse*
> recently.

Yes, something did change in GNOME recently. Prior to GNOME 3.28 there was a GTK preference called gtk-application-prefer-dark-theme that could be used to get dark widgets. This could either be set in ~/.config/gnome-terminal/gtk-3.0/settings.ini. This was also exposed as a toggle option in the gnome-tweaks tool, which is probably how most users had set it it. This GTK option has been deprecated in GNOME 3.28, and the new way to get a dark theme is to explicitly set one's GTK theme to Adwaita dark. You can read about this a bit more at [1] and [2].

Firefox apparently has some logic to ignore gtk-application-prefer-dark-theme, but that logic no longer works on GNOME 3.28 with the Adwaita dark theme. As was mentioned in comment #43, the work around for GNOME 3.28 is to set a user pref (i.e. in about:config or user.js) that sets widget.content.gtk-theme-override to Adwaita:light.

As I suspect the overwhelming majority of Firefox users with dark GTK themes are using Adwaita dark (which is bundled with GNOME), I would suggest updating the Firefox dark them detection logic to handle the new case with the Adwait theme names hard coded. This is hacky, but probably mitigates the issue for most users.


I've got a patch up to try to mitigate the issue for GNOME 3.28 over at bug #1461538.

Evan, what that patch will not do is fix the input field issue on explicitly chosen dark themes. What I would recommend instead is simply making this bit of userContent.css equivalent completely override Gtk regardless of theme, to produce the desired output:

INPUT, TEXTAREA {color: black ; background: #ffffff ; }

This is the general case which websites expect, and which users expect, and in my testing does not interfere with sites that explicitly set up a different color combination for text input areas. I don't even think it's -possible- to recreate this bug on the Windows or Mac ports without manually messing with userContent.css, so forcibly overriding Gtk here seems like the intelligent thing to do.

(possible way to solve this issue?)

One option might be to remove all dependency on system themes.
Firefox shouldn't care about the system themes. No dependence.

All text should be rendered:
    1. like the .css developer wanted
or, 2. if he uses !important, render it simply black on white.

In a nutshell, default FF canvas(for everything, including input boxes) and font should be white and black respectively.
We shouldn't inherit this from the system theme. Why should we? Do we really need to?

Hope this would nullify @dbaron sir's requirements and make it easier to implement this, sooner.

Thank You

[Please do not ban me if this does not help. Ping me and I'll remove it myself.
This is my first time coming out with ideas as stupid as this :)]

I predict that Apple is going to fix this bug in a few years, by evangelizing @media(prefers-color-theme: dark) all over the Web.

I hit this bug today by choosing the dark Adwaita theme in Gnome 3.28 and Firefox 65.0. It's amazing that this is an 18 year old bug. I found it surprising the system theme did anything to webpages and had two consecutive surprises:

- First setting the system theme to Adwaita-dark changed the Firefox theme. That makes sense. What was surprising was that the Firefox theme then changed the content of the web pages. My mental model of a browser is that within the page view it's a different world and there's no reason for the web to look different to match the browser chrome or the system theme.
- Because I didn't actually like the dark version of Firefox I switched it to the Light theme manually (webpages are usually light colored and so dark chrome in browsers looks weird). And yet even after doing this pages still had dark buttons and input areas. That was even stranger. Now Firefox had a light theme and yet the webpages were still picking up broken colors from the system theme inconsistent with the Firefox chrome theme.

I fixed this after some web searches by setting "widget.content.gtk-theme-override:Adwaita". That at least sets a light theme for UI controls and is back to looking reasonable. I found that in bug #1283086 which seems to be a 3 year old duplicate of this 18 year old bug. The proposal for removal of all native theming in #1411425 makes perfect sense.

In the mean time, could `widget.content.gtk-theme-override` be set to `Adwaita` by default? This would fix the issue (except for the settings page), and Adwaita is always present on systems with GTK+. I opened for this change, everyone please go comment on that bug :)

So I think it would be useful to know, for the current round of complaints, are the problems the result of:

1. Firefox incorrectly gets data out of the GTK theme, so that its default appearance for controls doesn't match the native one, or
2. Firefox gets the data out of the theme correctly, but then web pages override one but not both of color and background (while assuming that color is dark and background is light), leading to an unreadable result

We've had both problems in the past, and it would be useful to know which of them is happening in the set of problems that have spiked in the past few months.

David: The problem here is point 2. Just setting `widget.content.gtk-theme-override` to `Adwaita` by default would fix this for web pages, but the General -> Startup section of the Settings page still looks wrong (white text on a white background), along with a couple of other spots in Settings, despite setting this pref.

If you uncheck "Use System Colors" it's no longer a problem.

I have "Use System Colors" unchecked, `widget.content.gtk-theme-override` set to `Adwaita` and the Light theme selected. And yet even then the Ctrl-F input has white text over white background.

re comment 57, with those settings (on Ubuntu 18.04), I see white text on a dark background.

I'm also using Ubuntu 18.04 but using the vanilla GNOME session (that uses Wayland) with the dark Adwaita theme selected. Could you please test with that to see if you get the same result?

System colors (and it's override) is covered by Bug 1422563
Dark Gtk theme is covered by Bug 1527048

btw. widget.content.gtk-theme-override should be set to "Adwaita:light" and works only when e10s is enabled.

I seem to have e10s enabled:

Multiprocess Windows 1/1 Enabled by default

and have set Adwaita:light:


I still get white text on white background on the Find textbox within webpages.

Here's a simple way to replicate this bug for me. In both cases I have the Light theme selected:

$ GTK_THEME="Adwaita:dark" firefox
(firefox runs and the Find box has white text on white background)

$ GTK_THEME="Adwaita:light" firefox
(firefox runs and the Find box has the correct black text on white background)

Scott Palmer (skewty) wrote :

I am having this issue with Firefox 66.0.3 using Ubuntu 19.04 (Gnome 3.32 using Adwaita dark).

This release seems to ignore:

  widget.content.allow-gtk-dark-theme in about:config is set to default / false in about:config is also default /false

I came back to Firefox after running Brave for a bit only to find this....
Is this just another Mozilla blunder? Time to install Brave again.

Scott Palmer (skewty) wrote :

For those that run linux and want to update their Firefox icon so it automatically launches with GTK_THEME="Adwaita:light" firefox %u instead (band-aid work around that shouldn't need to be).

$ cp /usr/share/applications/firefox.desktop ~/.local/share/applications
$ gedit ~/.local/share/applications/firefox.desktop

Change the "Exec=" line to read:

Exec=bash -c "GTK_THEME=\"Adwaita:light\" firefox %u &"

Save and Exit.
Now your Firefox icon should start using the Adwaita:light theme without a lingering terminal window.

Can this be resolved fixed due to Bug 1527048 being fixed?

Yes, duplicate of Bug 1527048.

*** This bug has been marked as a duplicate of bug 1527048 ***

Changed in xulrunner:
status: Confirmed → Invalid
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