New thread for this issue referenced in this one: https://www.displayfusion.com/Discussions/View/beta4-moving-maximized-window-by-dragging-stopped-working/?ID=0ce947ac-37fe-4338-9af6-609a401f4e49#31

Unfortunately, I can't make a video of the issue because it's very sporadic, I can't even reproduce it willingly, and so far I was unable to figure out what triggers it.

The problem: Firefox moves to next monitor as if I was middle-clicking the titlebar even though I was trying to open a link somewhere inside the window by middle-clicking on it.

I don't want to enable logging for a long time - sometimes even days pass by without encountering it - so right now I'm looking for ideas about what could cause this or suggestions as to how to reproduce it.

Sounds great, thanks!
No specific websites that I can think of, doesn't even have to be any website, happens also when middle-clicking on a tab to close it or somewhere else inside the window.

This also started happning to me since the latest 10.1 update. Window moves sporatically to the next monitor when middle-clicking tabs in Firefox

This is occuring with me as well with the 10.1.1 upgrade. Running Firefox 117.0.1 (64-bit) official release.

Thank you for the fix, I haven't been experiencing this issue with 10.1.2-Beta1 - neither with the version right before that though, so this might need confirmation from the other people who had this problem.

The beta above has fixed this issue for me, thanks!