Mozilla doesn't save settings of CONTINUE WHERE I LEFT OFF and now it crashed like all the TABS are blank while I was still working on something, FIX IT!
Tried your troubleshooting like refreshing or deleting some prefs or something, but it still just wont save, and another thing just happened, it crashed in a way that everything was just blank and I do mean everything.
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Start Firefox in Safe Mode {web link} by holding down the <Shift> (Mac=Options) key, and then starting Firefox.
A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?
While still in Safe Mode,
In the address bar, type about:crashes<enter>. Note: If any reports do not have BP- in front of the numbers/letters, click it to submit them.
The crash report is several pages of data. We need the report numbers to see the whole report.
Using your mouse, mark the most recent 7 - 10 crash reports, and copy them. Now go to the reply box and paste them in.
For more help on crash reports, see; https://support.mozilla.org/en-US/kb/firefox-crashes-asking-support
My experiences with sessionstore after a crash is very good. Things have gotten a lot better in the last couple of years.
I agree with FredMcD, let's try to figure out what's happening to cause those crashes.