Open Bug 1575635 Opened 3 months ago Updated 18 days ago

FF won't open maximized on mon2 when mon1 is fullscreen


(Core :: Window Management, defect, P3)




Tracking Status
firefox68 --- affected
firefox69 --- affected
firefox70 --- affected


(Reporter: funnyj, Unassigned)


User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Firefox/68.0

Steps to reproduce:

two monitors, open a video on top monitor using firefox. Then open a new instance of firefox on the lower monitor maximized (I always use FF in maximized mode and my shortcuts are set up this way, to always open maximized) BUT FF only opens non-maximized, it cannot open maximized if there is another instance of FF open in full screen

Actual results:

I made an FF community post about this but no one responded. Here is the link and text.....

Using Win10 and FF 68.0.2

I have two taskbar menu shortcuts, one opens FF maximized on monitor1, the other opens FF maximized on monitor2. They work correctly.

BUT, when I am watching a video on monitor1 in FF fullscreen mode and then I click the shortcut to open a second instance of FF maximized on monitor2, that second instance always opens non-maximized. Its as though FF realizes that it has an instance open in full screen mode and that's why it opens the next instance in non-maximized mode. I am hoping someone can tell me how to have the second instance override this behavior so it will open maximized on monitor2 like it always does. Thanks.

EDIT: When I say fullscreen I was referring to a browser video being played full screen, although the issue is the same when using the normal F11 full screen and there is no video.

Expected results:

What should happen is the firefox should open maximized on monitor 2.

Hi John,

Thanks for the details. I was able to reproduce the bug on the following versions:

release 68.0.2 (64-bit), nightly 70.0a1 (2019-08-27) (64-bit) and Beta 69.0b16 (64-bit).

I've chosen a component. If you consider that there's another component that's more proper for this case you may change it.

Component: Untriaged → Audio/Video
Product: Firefox → Core
Version: 68 Branch → Trunk
Ever confirmed: true

Thank you Florencia. You figured out what I was saying but for the benefit of others, and In the interest of being precise, above when I wrote....

"Steps to reproduce: - two monitors, open a video on top monitor using firefox."

I SHOULD have written

"Steps to reproduce: - two monitors, open a video in FULL SCREEN mode on top monitor using firefox."

It seems to me this is not a video/audio decode or play issue. Move this to Window management for now.

Component: Audio/Video → Window Management
Priority: -- → P3
You need to log in before you can comment on or make changes to this bug.