That was a long night. The crashing took precedence....simply becasue linux wuld not stay open long enough to 'play' with firefox and trash-mail.
After some exhaustive testing it turned out to be hardware.....a pcie card which I bought to plug my ssd into and increase its speed etc etc etc...
I did a restore to one of the dates on which trashmail could not exist....and the restore failed....because it could not find the ssd
Basically....it died. permanently.
I took the ssd card out and hooked up the ssd in normal fashion....and the crashes have gone.
back on topic : I have opened and shut firefox numerous times and the 'tab' does not reappear.....and yes, Bat66, you are quite correct it was a 'pinned tab'....I will have to be a damn site more diligent in future......not sure what i clicked on to bring that about.
Lipper....i took a peek in startup applications and there is nothing there worthy of mention. I disabled one which is no longer on my pc.
The problem is gone.
ps...I have a new motherboard and cpu etc coming...mebbe today...mebbe early next week......my ssd will finally achieve what it is meant to achieve, and the "weirdness" that I have experienced with this motherboard will forever disappear !
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...