Similar to bug 554245, but the other way around. When the default theme is active, and a lightweight theme is enabled, an install status indicator is incorrectly shown.
Landed on trunk as a part of bug 554007
Verified fixed with Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.3a5pre) Gecko/20100517 Minefield/3.7a5pre (.NET CLR 3.5.30729) ID:20100517035949
What parts can automatically be tested and where do we need manual tests?
Any automated testing is going to be rather awkward here, I think.