''Lusifar [[#question-1209354|said]]'' <blockquote> I have downgraded to v 58 for now. </blockquote> Does that mean you don't have the problem with v 58? <blockquote> And try to restore previous season. </blockquote> What do you mean by this? <blockquote> It stays minimize all the time. </blockquote> https://support.mozilla.org/en-US/kb/changes-toolbars-and-window-sizes-are-not-saved You may have corrupt '''xulstore.json''' or '''Localstore.rdf''' file. '''Close Firefox. ''' Open your file browser to this hidden location: * '''Mac: ''' *~/Library/Application Support/Firefox/Profiles * '''Linux: ''' *~/.mozilla/firefox/Profiles * '''Windows: ''' %AppData%\Mozilla\Firefox\Profiles * *C:\Users\<user>\AppData\Roaming\Mozilla\Firefox\Profiles * '''Windows XP: ''' C:\Documents and Settings\<user>\Application Data<br> \Mozilla\Firefox\Profiles\ Search for the above files. Then rename or delete them. Restart Firefox.