MAC creates and saves each newly created Temporary Container
MAC does not save Temporary Containers

MAC shows all containers added to Firefox using the native API, and TCs aren't special somehow (despite the fact that the TC Add-on removes them after a while), which is why they're listed as well.
Would love to see this changed to exclude tmp containers. I had to disable sync because it was amplifying the number of these so much. I had 100+ of them syncing between the various installs of FF that I have. The UI to configure temp container lifetime seems to have disappeared too, forcing me to need to clean these up after sync by hand.
I think part of the reason is because TC has the ability to convert temp to perm container and vice versa.
I've tested and It's compatible with MA-C.
Does anyone have a workaround to remove all these temp containers with one command? Going through each one of them manually is just too painful.
@lestephane Maybe https://github.com/stoically/temporary-containers/issues/371#issuecomment-615861439 can be of help
The temporary containers get saved and are impossible to delete, as they re-appear on sync!