Created attachment 8667240 [details] Screenshot showing the issue Affected platforms: - latest Nightly 44.0a1 - latest Aurora 43.0a2 - Firefox 42 beta 2 Affected OS`s: - Ubuntu 14.04 64-bit STR: 1. Start Firefox 2. Click on hamburger button 3. Click 'Sign In to Sync' 4. Sign In 5. Click hamburger button 6. Hover 'Sync Now' button Expected results: The whole button is highlighted over hover. Actual results: There is a row of pixels that`s not highlighted when hovering. Notes: 1. Not sure if this is a regression, will check asap.
status-firefox42: --- → affected
status-firefox43: --- → affected
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