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I have a small 13inch screen with a resolution of 3200x1800px. Now I can change the default font-size with the Addon NoSquint, but the icons in Firefox are still tiny.

How do I change the icon size?

rubo77
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A nice trick here is to play with GTK dpi:

  • Double dpi factor:

    gsettings set org.gnome.desktop.interface text-scaling-factor 2.0

  • Launch Firefox

  • Change back dpi factor, so it will not affect other applications:

    gsettings set org.gnome.desktop.interface text-scaling-factor 1.0

You may create a script for that or a desktop launcher. (You may use any float number like 1.5, 3.5...)

Reference: ArchLinux: Applications & Desktop Environments: Gnome3 and DPI

user.dz
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    You can also set the scale-factor in https://apps.ubuntu.com/cat/applications/unity-tweak-tool/ – rubo77 Apr 18 '14 at 20:01
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    But ince this is only a trick, I leave this question open for a better answer, that really solves it for everyone without such a hack. – rubo77 May 03 '14 at 00:34
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    Since some Firefox versions it seems to be fixed and Firefox listens to the global settings of the [System wide Menu and titlebar scaling](http://askubuntu.com/questions/472262/adapt-ubuntu-to-a-high-dpi-resolution-screen/472266#472266) – rubo77 Jun 25 '15 at 07:50