I have opened a dozen Firefox windows and I have about twenty tabs in every window. I have set, that FF starts with tabs from last session (that is what I want).
Now, Firefox sometimes crashes (when running long - maybe after an hour or after a few hours).
But, in addition, Firefox crashes always, when I exit it.
So now, I would like to preserve some of tabs.
So, I close some other tabs, then I quit the FF - and it crashes in that moment. And when I start the FF again, it forget!, that I closed some tabs -> it means, that FF opens all tabs including those, what were not opened in time of closing the FF. (in other words, FF open not only the tabs, what existed in the moment of last closing FF, but also the tabs, what was closed some time before the moment of closing the FF)
Notice: I run FF 47.0 on Windows 7 Home Premium SP1 32bit on Intel Core 2 Duo 4GB RAM.
Notice2 (or question2): There is very very DNS lookup requests from FF after it starts - it is ok? These big amount of DNS request totaly slow down network for some minute(s) (I suppose, the Zyxel DSL modem is place, where congestion happen)