Wrong size of icon, if launcher put on desktop

[Coeur Noir]

Hi,

as off Firefox 59, if a launcher is put on desktop, its icon size is too large.

The culprit may be a missing icons folder ?

Testing on a liveUSB of Ubuntu 16.04.1 here I get :
https://postimg.org/image/6t98217zt/
left window is the liveUSB, right window is my actual 16.04 installation.

Right after upgrading FF to newer version, I get :
https://postimg.org/image/cu6wz42bt/
left window is still the liveUSB.
« icons » folder disappeared while upgrading FF
and then instantly icon get much larger on desktop.

It's not unity related : see https://bugzilla.mozilla.org/show_bug.cgi?id=1446262 or https://ubuntu-mate.community/t/firefox-v59-has-a-ridiculously-large-static-desktop-icon/16205/3 or https://forum.ubuntu-fr.org/viewtopic.php?id=2023636

The workarounds provided by those topics are not reliable fixes.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[nmaxx (nmaxx)]

I noticed the same problem in Ubuntu MATE 18.04 beta 1, updated to the current state as of 2018-03-30.
The FF desktop icon is enormous. The huge icon also appears in the combo box of "Preferred Applications" for setting the default browser.
On my regular 16.04 installation it looks fine, though.

[Coeur Noir (coeur-noir)]

( sorry, postimg.org is now postimg.cc so here are new links to pictures )

https://postimg.cc/image/6t98217zt/

https://postimg.cc/image/cu6wz42bt/

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1760144

[Alexander Browne (elcste)]

The large icon also shows up with the Ubuntu MATE Dock panel applet.

[Coeur Noir (coeur-noir)]

Maybe it's not only Firefox related, here is a too large icon for a web-app made through Chromium :
https://postimg.cc/image/x82eye7t5/
https://postimg.cc/image/od1knw661/

[nmaxx (nmaxx)]

It's now improved in 18.04 with Firefox version 60.0.1+build2-0ubuntu0.18.04.1.
Dragging the FF icon from the menu to the Desktop now creates a correctly sized icon.
However, in "Preferred Applications" the icon is still a bit too large.
See attached ff.png.