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I'm running Thunderbird 8 on Ubuntu 11.10, and I'm stuck with these monochrome toolbar buttons that I hate. If I look under Tools > Add Ons > Appearance I've only got the default theme installed and the sample icons are full color. The icons I'm seeing are decidedly not full color. I was able to install the Gnome Tweak Tool which let met change the rest of my Unity icons to full color by switching the "icon theme" to "Unity-icon-theme" (it was Unity-mono-dark). Now only my Thunderbird icons are monochrome.

How is Unity overriding the default Thunderbird theme?

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It seems it is part of the default theme according to this thread

The solution offered is to download another theme from the gallery.

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I still don't believe this. When I look in my themes, the preview of "default" has colored icons! – Amanda Dec 5 '11 at 19:10

While this is not a completely reasonable solution it is possible to restore the old icon set by downloading a copy of Thunderbird for Linux. Decompress the application and then copy "omni.ja" out of the new "thunderbird" folder into your local install of Thunderbird (On my system this was /usr/lib/thunderbird-11.0). This should undo the default Ubuntu theme.

WARNING: I have no idea if it is necessary to download the EXACT same version of Thunderbird that is already installed in order for this trick to work.

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Do you know if it is possible to isolate omni.ja from a Thunderbird source repository? – Amanda Mar 26 '12 at 21:07

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