Hello all. I have a small problem. I've used DisplayFusion for years with the same profile and no worries. I have a 32:9 monitor divided in a 16:9 central part and two smaller parts on each side. Recently, I can't say exactly when it started, I noticed a problem with Firefox only: it doesn't maximize to the division size (any of them) but to the whole monitor size. However, when I click on the buttons to make it move from one division to the next, it works as intended.

v111.0.1 (64bits), the latest with auto update activated.

Thanks for helping me. Here's the file.

I don't know how to record videos of the desktop, so I took two screenshots. The only difference between the two is a click on the maximize button of Firefox. I also have run it in repair mode so all addons are off. Any of my other applications maximizes to the size of the central division, as expected.

Here it is, at 16:56 GMT+2

Just so you know, I installed and tested an older version of Firefox, version 106 from october 2022, and it has the same problem. I used that version at that time with DisplayFusion (I don't remember which beta version it was then) and the same setup/profile and all worked well then.

No, as expected, version 9.9 works as intended with Firefox.

Yep, it does work.

Nope, it doesn't.

Okay, I've done some more tests. Beta 18 works, beta 19 makes Firefox (older version or latest) bug/freeze, beta 20 and later ones do not work (but no more bugs like beta 19).
I've joined a screenshot of my monitor profile if it can help, but I have others and any type of division causes the same problem.

No, I tried first in normal mode, then in repair mode to check if the problem might have been related to the use of addons in Firefox, but both configurations had the same result.

Thanks a lot to you and the team for your time and your help. I'll wait and use beta 18 for the moment.

It works perfectly after updating, thank you so much