Firefox 3.0.3 displays messed text on a particular page in Ubuntu 8.04

[Answ]

Binary package hint: firefox-3.0

Firefox 3.0.3 displays messed text on a particular page in Ubuntu 8.04:
http://sourceware.org/pthreads-win32/bugs.html
Sometimes (circa 1 of 10) it renders right but scrolling always makes it messy.
Problem checked on two independent computers.

Opera 9.52 and Dillo 2.0 renderings are great.

Previously I reported that it worked in Windows version of Firefox 3.0.3,
but it wasn't true. I thought (incorrectly) that it was the last version..

So Windows version is also affected.
This bug may be reported to the Firefox team and close this thread.

Screenshot is also impossible to take from this page because after pressing
PrintScrn the whole turns black.

ProblemType: Bug
Architecture: i386
Date: Mon Oct 27 13:31:00 2008
DistroRelease: Ubuntu 8.04
Package: firefox-3.0 3.0.3+build1+nobinonly-0ubuntu0.8.04.1
PackageArchitecture: i386
ProcEnviron:
 PATH=/home/username/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=hu_HU.UTF-8
 SHELL=/bin/bash
SourcePackage: firefox-3.0
Uname: Linux 2.6.24-21-server i686

[Tomasz 'Zen' Napierala (tzn)]

Thank you for taking your time and reporting the problem.
Confirming, the bug is still there. Devs will take a look at this.

[Answ (majdan-andras)]

I investigated the bug and found the cause:
hr with width 8388599 or less is OK
hr with width 8388600 or greater cause problem
Body background color must be set!

It is probably a 32 bit bug because 16777216/2=8388608.
(bit of sign)

And perhaps hr has padding or margin (2*4=8).

Someone could try it with a 64 bit version of Firefox..

[Answ (majdan-andras)]

Webpage containing this large hr width is generated by OpenOffice.

[Alexander Sack (asac)]

on linux (ubuntu intrepid/hardy), trunk and 3.0

  http://sourceware.org/pthreads-win32/bugs.html

causes text rendering issues (smearing) when scrolling.

Seems to be the large WIDTH value for the HR:

 <HR WIDTH=140182812 ALIGN=RIGHT>

This is forwarded from ubuntu bug: https://bugs.launchpad.net/ubuntu/+source/firefox-3.0/+bug/289839

one interesting hint from LP bug: "Webpage containing this large hr width is generated by OpenOffice."

[Alexander Sack (asac)]

forwarded upstream: https://bugzilla.mozilla.org/show_bug.cgi?id=462741 ... Would be cool if you could subscribe there and answer any questions devs might have.

[Alexander Sack (asac)]

Created attachment 345938
screen after scrolling

[Alexander Sack (asac)]

Created attachment 345939
before scrolling

[Ria-klaassen (ria-klaassen)]

Oh well, Windows is even worse, where I only see black instead of text, but if I load the Options window over it, I see text. Next, when I switch tabs and switch back, it is black again.

[Mats Palmgren (matspal)]

Bug 215055?

[Ria-klaassen (ria-klaassen)]

This regressed on 29 Oct 2008: http://bonsai.mozilla.org/cvsquery.cgi?module=PhoenixTinderbox&date=explicit&mindate=2007-10-28+22%3A00&maxdate=2007-10-30+00%3A00
I think this is caused by Bug 384681.

[Ria-klaassen (ria-klaassen)]

(In reply to comment #5)
> This regressed on 29 Oct 2008:
I meant 2007. :)

[Ria-klaassen (ria-klaassen)]

I think it should also be retested by someone on Linux, because it is not sure if we are talking about the same bug.

(In reply to comment #4)
> Bug 215055?

The black site I see is entirely black except the image on top, so not only on the bottom.

[Answ (majdan-andras)]

This bug is first appeared here:
(because I thought it was a Linux specific issue of Firefox
but later turned out that it also affected Windows version of the browser):
https://bugs.launchpad.net/ubuntu/+source/firefox-3.0/+bug/289839

I also made some research on it:
"I investigated the bug and found the cause:
hr with width 8388599 or less is OK
hr with width 8388600 or greater cause problem
Body background color must be set!

It is probably a 32 bit bug because 16777216/2=8388608.
(bit of sign)

And perhaps hr has padding or margin (2*4=8).

Someone could try it with a 64 bit version of Firefox.."

[Tnikkel (tnikkel)]

Does this problem still happen?

[Answ (majdan-andras)]

I've retested now with Firefox 10.0 on Fedora Core 16 and it seems to be fixed.
No rendering problem at all.
Someone should check on Windows too.

Anyway I'm curious about in which version was it fixed :)

[Tnikkel (tnikkel)]

Thanks for testing.

No problem on Windows XP either. Let's close this.