Thank you for the filehippo link. I used it to download 7.0 and 9.0.1; unfortunately none of the versions of FF I download ever gets past the "Checking for Add-ons" portion of installation (just as FF is being launched). It "checks for add-ons" for hours and hours, until you shut down the computer, and then the .exe process seems to terminate and just be dormant. How can I get around this "checking for add-ons" checkpoint so I can finally successfully launch an FF version?
the filehippo link in my last post has all versions listed on the right hand side ,click on the version you want to try ,then click on download this version ,top right of screen