User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:40.0) Gecko/20100101 Firefox/40.0 Build ID: 20150826023504 Steps to reproduce: Open a video on youtube and make it full screen, then press the shutdown button on your PC. Actual results: After starting back up(from a shutdown), start Firefox and it will open in full screen mode. Expected results: Firefox should open in the last used window position, however, a full screen button on a video shouldn't save as your default window behavior. This behavior started a few versions back and happens at least in Windows 7 and 10.

(In reply to morbicy from comment #0) > Firefox should open in the last used window position, however, a full screen > button on a video shouldn't save as your default window behavior. Why not?

(In reply to :Gijs Kruitbosch from comment #1) > (In reply to morbicy from comment #0) > > Firefox should open in the last used window position, however, a full screen > > button on a video shouldn't save as your default window behavior. > > Why not? A video shouldn't over-right -any- settings at all. Why should a button from a third party change an applications behavior?

(In reply to morbicy from comment #2) > (In reply to :Gijs Kruitbosch from comment #1) > > (In reply to morbicy from comment #0) > > > Firefox should open in the last used window position, however, a full screen > > > button on a video shouldn't save as your default window behavior. > > > > Why not? > > A video shouldn't over-right -any- settings at all. Why should a button > from a third party change an applications behavior? overwrite*

(In reply to morbicy from comment #2) > (In reply to :Gijs Kruitbosch from comment #1) > > (In reply to morbicy from comment #0) > > > Firefox should open in the last used window position, however, a full screen > > > button on a video shouldn't save as your default window behavior. > > > > Why not? > > A video shouldn't over-right -any- settings at all. Why should a button > from a third party change an applications behavior? It's not the video that overwrites any settings (that would be a security issue). You override the settings by going into fullscreen mode. The same happens if you use F11. I can understand how this feels counterintuitive if you don't restore your tabs automatically when Firefox restarts, and you get about:home or your start page in fullscreen mode. However, for people that do restore tabs automatically, I expect that "fixing" this bug would feel like a regression: if they were watching a video in fullscreen, closed Firefox, and then restart Firefox, they expect the same video will be back in fullscreen when restarting, and that seems like a sensible expectation, which fixing this bug (as-written) would break. Making the restoration conditional on that preference (ie whether tabs get restored when restarting Firefox) feels wrong, but might be the most sensible thing to do. Philipp, thoughts/ideas?

Orginal bug was solved and will by pushed to mozilla44. To be honest I believe solution should be to give settings toggle (f.e. allow restoring to fullscreen mode or 3 position toggle 1 Do not restore to FS, 2. Restore to state on close, 3. Always start at FS). What do you think?

(In reply to olek.budzinski from comment #6) > Orginal bug was solved and will by pushed to mozilla44. > To be honest I believe solution should be to give settings toggle (f.e. > allow restoring to fullscreen mode or 3 position toggle 1 Do not restore to > FS, 2. Restore to state on close, 3. Always start at FS). What do you think? No, there exist various issues to restore to fullscreen mode, especially on OS X and Win 10, and other browsers no longer restore to fullscreen mode either.