Created attachment 8452281 [details] Firefox High DPI tab overlapping bug.png User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:30.0) Gecko/20100101 Firefox/30.0 (Beta/Release) Build ID: 20140605174243 Steps to reproduce: 1. Open multiple FireFox windows on a machine running Windows 8.1 and that has a high DPI display. I'm reproducing this on a DELL XPS 15 Touch with DPI set to 200%. 2. In each window open several tabs so that the tabs extend beyond the available horizontal space that is normally visible for tabs. 3. Switch display to show only on a standard HD display. In my case I'm usin gan LG IPS LED 27EA33 monitory at a resolution of 1920 x 1080. Actual results: The tabs in each window show as overlapped and bleed through one another visually when the Winodws are maximized. When a window is minimized it shows up as black background in the tab area and just a slight outlining is shown for each tab. Expected results: The tabs should have adjusted visually as expected when switching display regardless of the resolution and DPI settings for this display.
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