If you decide to come back to Firefox, try posting this problem on the Mozilla Support site. They have a team of support volunteers to troubleshoot malfunctions with your currently installed version of Firefox, while this site is focused on idea submissions for future versions of Firefox (looking ahead anywhere from 8 weeks to many months). Here's a link to the new question form (for Windows/Mac/Linux): https://mzl.la/3y1vQUQ
And as a first step, try Troubleshoot Mode: https://support.mozilla.org/kb/diagnose-firefox-issues-using-troubleshoot-mode
