Created attachment 8731091 [details] Capture.PNG User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:47.0) Gecko/20100101 Firefox/47.0 Build ID: 20160315004019 Steps to reproduce: Whilst testing 1257071, I plugged and unplugged the secondary and tertiary (low-density) monitors from my (high-density) Surface Pro multiple times. Actual results: Upon then moving Firefox back to a low-density display, I moved to an existing tab. The tab's contents do not fill the space available. It seems to instead occupy 1280x657 pixels. This doesn't appear to be related to my SP3 display's resolution, which has 2160x1440 physical pixels and 1440x960 logical pixels. New tabs are not affected. Expected results: The existing tabs should fill the available space.
OS: Unspecified → Windows 10
Hardware: Unspecified → x86_64
Note that refreshing affected tabs resolves the issue, as does changing the size of the Firefox window (by restoring and then maximising again, for example).
I haven't seen this behaviour now for at least a year, so I'll mark this one as WORKSFORME.
Status: UNCONFIRMED → RESOLVED
Last Resolved: 5 months ago
Resolution: --- → WORKSFORME
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