Created attachment 676927 [details] about support.txt User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:19.0) Gecko/19.0 Firefox/19.0 Build ID: 20121030030633 Steps to reproduce: 1. Enable debug paint flashing 2. Open a new tab. 3. Put mouse on the nightly button in the top left corner. Actual results: The entire tab bar repaints. Expected results: Minimal repaint.
If you open ~25 tabs (even newTabs) then you can observe large janks in the profiler.
Summary: Mouse hover on the Nightly Button causes whole tab bar to repaint → Nightly Button repaints the whole tab bar
Mozilla/5.0 (Windows NT 6.1; rv:19.0) Gecko/19.0 Firefox/19.0 Buid ID: 20121105030642 I can confirm that the tab bar repaints entirely.
Component: Untriaged → Layout
Product: Firefox → Core
can also reproduce this on FF15. So its probably an old bug.
WFM with 2012-11-01-03-07-05-mozilla-central-firefox-19.0a1.en-US.linux-x86_64
No longer blocks: 539356
Status: UNCONFIRMED → RESOLVED
Last Resolved: 6 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 786485
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