Why would refreshing Firefox cause it to no longer work? That's what happened to me after it was recommended I do so.
I got a message telling me that Firefox seemed slow and it was suggested that I do a refresh. After I did the refresh I cannot seem to do anything in Firefox at all, as now it is excruciatingly slow, to the point of not being useful at all. It really wasn't that slow before, so I'm very upset about this.
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Refresh Firefox {web link} is a LAST RESORT ! !
Refresh Firefox - reset add-ons and settings
If you're having problems with Firefox, refreshing it can help. The refresh feature fixes many issues by restoring Firefox to its default state while saving your essential information like bookmarks, passwords, and open tabs.
Look on your desktop. Do you see a folder called; Old Firefox?
https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile
https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles