I have not had a change to test this on older Ubuntus with the new nightly firefox yet but I can confirm this is a issue with 15.04 & 15.10 . And since when this hits in the latest firefox (that will be shipped on nearly all supported Ubuntu builds) this fix may need to be tested and applied to older and newer builds of Ambaince Themes (EG one in 14.04 , 12.04 etc.) I am not sure yet however.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1478173 Title: Ambiance & Radiance themes are missing a "background-color" for tooltip elements (needed for GTK3-enabled Firefox Nightly) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-themes/+bug/1478173/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
