After troubleshooting for a few hours, I still cannot find a proper solution. Effectively, I learned that if I create a new profile user, with this command in windows Run: "C:\Program Files\Mozilla Firefox\firefox.exe" -p , I can open the user profile menu manually, and create/delete a new/not-new user, and upon creating and using a new one, it works fine. For a couple of times opening the browser, anyway, in which it results in the same problem as before. I took a list and compared the old files to a brand new users files, and did find some differences. Take these into effect,

The compatability and extensions .ini files were differed by 3 kb , with a new user being 1, and the old user being 4. The Local Store .rdf file differed from 2 for a new user, to 4 for an old user. The Mime Types .rdf file differed from 3 for a new user to 4 for an old user. Plugin Reg(istry?) .dat differed from 17 new to 20 old. Search.json differed from 13 new to 16 old. Search Metadata.json differed from 1 new to 4 old. URL Classifier Key 3.txt differed from 1 new to 4 old. Web App Store.sqlite differed from 96 new to 128 old. (All units are KB) Seeing as a few articles relating to the problem are "no longer maintained" and the solutions work only temporarily, I came here hoping to fix this little issue. Thank you, and good luck in advance. -Av Note; the first crash ID is for the new user that crashed, the last is for an old user.