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Are you running a specific icon theme? Firefox uses the icon theme you've selected. You do not specify which DE you're running, but for example, Xfce will let you pick icon themes that Firefox will also use then.
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Yep, forgot to mention those things.
I don't use any specific icon theme. Just the one Firefox is shipped with. I am using KDE 4 and Clearooks gtk engine.
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What icons do you have installed?
pacman -Qqs iconOffline
gnome-icon-theme
gnome-icon-theme-symbolic
gtk-update-icon-cache
hicolor-icon-theme
icon-naming-utils
kdeartwork-emoticons
kdeartwork-iconthemes
kdepim-akonadiconsole
kdeplasma-addons-applets-icontasks
oxygen-icons
perl-gtk2-trayicon
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The problem (?) must be hicolor-icon-theme. I doesn't seem to contain any icons. Only folders.
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So, hicolor-icon-theme must be empty for third party applications to put icons. Right?
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Is it just Firefox that is not using your icon theme? Or all are GTK apps affected? Did this ever work and it stopped working? If so, do you recall what you may have changed?
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It seems it is all the gtk applications affected.
The only thing I didn't revert to the date before the issue and could be relevant is KDE-4.13. I changed the icons to Oxygen for gtk, for now.
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I have gnome-icon-theme installed and it seems to work.
I'm not using any DE, just dwm.
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