Whenever I start Firefox, with normally not more than a couple of tabs, do some work, then drink coffee, screensaver activates, and when I return, the window of Firefox is suddenly (after the last update 133.0.3) is a very small one, left top corner of the screen. I read in the update descriptions, that this problem was supposed to be resolved in version 133.0.3, but present in version 133.0.0. Seems like for me that didn't work, I got it installed when updating. I went looking for others with similar issues, found a couple with tab problems, and also sometimes it's not a Firefox problem, but more a screensaver issue.

Some technical details: Windows 11 Pro (24H2, updated 1/1/2025, 26100.2605)