Wurdearring: 1 fan de 5 stjerren

@helvete1337
thanks to point out that Unloadtabs is responsible of that problem I had.
I can add that it is though mainly a problem with Firefox because it works well if you downgrade to v40.0.3
so no lose of the URLs of the tab, even if unloaded.
Though Session manager ought to try to fix this. Or Unloadtabs.

Dizze beoardieling giet oer in eardere ferzje fan de add-on (0.8.1.12).  Dizze brûker hat 7 eardere beoardielingen fan dizze add-on.