This got fixed by Thunderbird 31. Great!
See
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1347124/comments/5
** Changed in: thunderbird (Ubuntu)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/1004841
Title:
Thunderbird Icon set is broken (ugly, black and white icons)
Status in “thunderbird” package in Ubuntu:
Fix Released
Bug description:
Since Oneiric the standard theme in thunderbird is broken. In Oneiric (and
Precise) some of the coloured Icons were replaced by black&white pictograms,
but not consistently all. For example the Lightning Icons still remain
coloured, as they were before.
I don't know why some Icons were replaced by pictograms (is this because of a
new GTK-Theme?) , this is only in the Linux version of TB, the Windows version
still has the coloured icons. It would have been better if the old standard
theme remains untouched, and a new theme would have been created for the new
black&white pictograms.
See attached screenshot for the weird icons.
Possible work-around: Download Thunderbird from mozilla, extract a
file called omni.ja and overwrite the copy at /usr/lib/thunderbird/.
Not sure if this has undesired effects (it may delete all your email,
so be careful!), but it works for me.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1004841/+subscriptions
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