No Container tabs should survive Firefox restarts

[stoically]

Currently when opening No Container tabs (with the shortcuts Alt+N and Alt+Shift+C), those will get converted to temporary containers (with Automatic Mode) on Firefox restart. The reason for that is that tab ids change when Firefox restarts.

Something that might work to fix this is using session.setTabValue. This requires the sessions permission, so if that pops up as additional permission request notice, it would need to be an optional preference.