User Agent: Mozilla/5.0 (Windows NT 6.2; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36
Steps to reproduce:
i have longer term issue with FIrefox (currently 66.0b4) and Tor browser (currently based on Firefox 60.5.0esr), i bet issue started sometime with Quantum arrival.
Maximised window has side margins (not maximised to the edges of the screen - left, right). And more importantly:
very soon happen that i am not able to restore minimized firefox window (it do not restore, only shows tabs in the Windows 10 64b context menu when i right click the taskbar item) and i have to close Firefox.
On start it is maximised correctly for like 3 seconds but then go wrong.
- Firefox window that is not maximised usually can not be resized (do not change mouse cursor to resizing).
When i open new window, then it is maximised properly. But when i unmaximise new window and maximise, it gets wrong.
When i do F11 to show full screen, and restore back, i can resize and move unmaximised window. (I was unable to even move it today for a while).
Another issue i spot is that sometimes maximizing Window hides MS WIndows taskbar (where are app icons, tray and start button)
when i unmaximize window, it shrinks its height significantly. But width is kept as i set it.
My Windows is NOT fully up to date.