How about:
Hey @Flinch2253 and @anon82835297 I’ve been playing around with Firefox Profiles for a bit and found them HORRID 
, I have played with Vivaldi and found its ‘Profiles’ so much more civilized lol. 
Have you tried the FF extension Simple Tab Groups? I’m not sure about sandboxing, but it is the best way I’ve found to manage separate Firefox uses (I have a few different STG profiles for different research areas).
It is simple to backup, organize, and manage too! Compatible with Containers.
BleachBit for cleaning.
SyncThing (SyncTrazor) for syncing folders between PCs.
I used to use Geek Uninstaller until I was pointed towards Revo Uninstaller which is fantastic. As an Open Source alternative, I’m just looking at ‘Bulk Crap Uninstaller’ which gets excellent reviews on Alternative To and FossHub 