Φόρουμ υποστήριξης - Firefox

I use Firefox version 103, the old version that is perfectly compatible with an extension I always use. I love this old version, and I don't want to update it to the new version. But the update reminder pops up many times everyday. it's so annoying. I used "about config" to turn it off (see photo 2); it works a bit, but the popup still there once daily after the configuration. I want to turn it off permanently. Is there any way to do it? Thank you very much!!

I have never maximized a Firefox window and I never will. After the latest update, all new windows, whether they are opened from another page via right-click or directly from the toolbar icon, open in a maximized view. I do not want this. Is there a way to prevent your program from inserting itself directly on top of everything else I'm working on? Have I accidentally changed a setting I cannot find again? I'd like to know if I need to find a new browser.