I have used Mozilla Firefox as my default browser, for years. Recently, I used a program to clean (what it said was) junk files from my computer. Unfortunately, I did not make a rescue point. After removal of the files, several of my programs, including Firefox, has no longer worked as it once did. I was always able to go into settings to select my browser, my search engine, my home page, etc. That is no longer possible. I was wondering if I should uninstall Firefox and reinstall - or is their another easier way to repair my problem?

Any help I can get is much appreciated.