This advice is not mine — it's from Mozilla Support — I'm just passing their information along.
This particular issue has affected me for months — I even went so far as to install a browser
sizer widget to try to work around it: My Firefox browser software would always open full screen —
not necessarily maximized, but... it sort of reminded me of JavaScript used back in the 1990's to
expand the browser to full screen. It didn't matter what I did to try to stop it.
This morning I guess I found the right combination of search terms to Google my way to the
aforementioned support article. The problem I was having can be traced to a corrupted XML file.
The solution, provided by Fred McD, suggested spelunking your AppData folder down to Firefox/
Profiles to find and delete xulstore.json. I found that file in a folder one level below — a lot
can happen in software over a year (Fred McD provided the solution in April, 2020).
Sure enough, once I deleted the file I was able to open Firefox, resize it, close it, and reopen
it at the size I'd previously set.
Thank you, Fred McD and Mozilla!
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