Fortunately it's fixed now.
Thunderbird 3.1.4
** Changed in: thunderbird (Ubuntu)
Status: New = Fix Released
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wrong colors when dark or other non-default system color theme used
https://bugs.launchpad.net/bugs/296240
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Still not fixed...
$ thunderbird --version
Thunderbird 2.0.0.23
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wrong colors when dark or other non-default system color theme used
https://bugs.launchpad.net/bugs/296240
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Bugs, which is subscribed to Ubuntu.
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I have this problem too. Why text colour is the system theme's and the
background colour is just white? Either use black text and white
background, or use the system theme's colours.
I suppose this is quick and simple to do... I hope next update fixes it.
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wrong colors when dark or other