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2nd Classic

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Looks like some Mac application.
2nd Classic is Simple and Clean Theme for Thunderbird 2.
by SmartBright

0 users
OxyBird2

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An Oxygen icon theme for Thunderbird 3.1 and Lightning 1.0b2
by Vimalkumar Velayudhan

0 users
PitchDark for TB

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Dark-colored minimalistic theme with emphasis on visibility, usability and maximum screen real estate.
by thebankshow

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Gnome (Linux integration)

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Gnome integration theme for practically every linux-distribution which uses gnome and its icons. Uses a lot of standard-theme icons, most icons should integrate fine in whatever icon-theme you're using.
by meckermaus

0 users