I would like to be able to use my legacy extensions. I will keep using the latest FF, but occasionally need data from my old "scrapbook" extension which doesn't work with FF 57
You are here
Where can I find a previous version of Firefox?
Firefox ESR is an extended support release. It's pegged to version 52 and will continue receiving security updates through April 2018: https://portableapps.com/apps/internet/firefox-portable-esr
No one should use Firefox 53 through 56 any longer as they have exploitable security issues and won't receive updates.
That all sounds good, but since the update, when I try and send a page to my printer (hp LaserJet Pro 401), I get an error message, one page spits out, but it's blank. This is only with Firefox 57
Grab Firefox ESR for now if you want to print anything and file a bug report with Mozilla. We have no control over printing.