Created attachment 8817826 [details] 2016-12-10 11_54_59-Enter A Bug.png User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:50.0) Gecko/20100101 Firefox/50.0 Build ID: 20161129173726 Steps to reproduce: Loaded up Firefox on a single 4k monitor, resolution 3840 x 2160. Moved my mouse to the top of the screen near multiple tabs to click on them. Actual results: The tab does not extend to the top of the screen, meaning when I click above any open tabs, it does not switch to that tab at all. Expected results: The tab extends to the top of screen on smaller resolutions, so when clicking anywhere near a tab, it switches to that tab. In the file I am attaching, if you look closely at my current tab, you will notice a gap that is a few pixels long. Clicking anywhere in that does not switch the tabs like I want; when that should be extended to the top of the screen so any click on a tab, will open it up.
Component: Untriaged → Tabbed Browser
OS: Unspecified → Windows 10
Hardware: Unspecified → x86_64
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