""For some reason, a number of my sites don't open on firefox ""
@ godzilla....also remember that this may be a sign of infection
If resetting Firefox does not cure the problem, you should start a new topic in AII (am i infected)....HERE
Firefox Sync stores your tabs, bookmarks, passwords, history , add ons, and preferences on firefox's server.
So when you reset firefox, all you have to do to get all those settings back is go to firefox preferences (click on the three horizontal lines in the top right hand corner of any firefox page, then cclick on preferences and then click on Sync )
so reinstalling add ons etc etc is easy as pie. !
You can also make a new profile...
THE INSTRUCTIONS ARE HERE
Just follow them step by step....any questions...come back here and ask.
Condobloke ...Outback Australian
fed up with Windows antics...??....LINUX IS THE ANSWER....I USE LINUX MINT 18.3 EXCLUSIVELY.
Microsoft gives you Windows, Linux gives you the whole house...