Maybe a silly question - but is it unwise to use Firefox for getting torrents, or saving any bookmarks in firefox? Is there benefit to using a private window (doubtful as I believe this only affects your device).
I know we generally can trust Firefox but they could turn quickly.
If you do not sync your bookmarks and such, and you do not install malicious plugins, then this information is as safe as your device itself is.
Firefox claims to use E2EE so It should be pretty safe to use their built-in sync as well.
It’s open source so if you feel like verifying all this, or compiling it on your own, you can.
Or you can use a completely separate instance or browser (perhaps ice weasel or even the Tor browser) just for the activity you want to keep separate.
You can also self-host the sync server.
Welp, looks like another container is going on my server.