The major issue I have with tabs is that there seems to be no way to tell Firefox to never ever, under any circumstance, create a new window for a profile. Whe

The major issue I have with tabs is that there seems to be no way to tell Firefox to never ever, under any circumstance, create a new window for a profile. When switching tabs via mouse it is way too easy to accidently cause it to open a tab in a new window and I also occasionally accidently open a new window via the right click menu. Not once in at least 5 years (most likely longer) have I actually wanted more than one window for a profile. I don't mind customizing things the way I want them, but it would be helpful if there was an easier way to share setting between profiles.