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Re:Facebook Container for Firefox by JadoJodo on Wednesday October 21, 2020 @02:45PM (#24850780)
"Delete no longer needed temporary containers 15 minutes after the last tab in it closes" is a default setting. This is not an issue I've experienced in the 3+ months I've been using this extension.

Are you sure you didn't accidentally change it?

Re:Facebook Container for Firefox by aendruk on Wednesday October 21, 2020 @03:56PM (#24851415)
I don't know what, but something causes it to leak. I've been using it for about a year and several of the low numbered containers have accumulated duplicates:

Edit: Apparently HN strips box drawing characters. Imagine the output of `sparklines 6 15 7 5 2 1 1 4 3 1 1 1 1 1 1 1`.

Re:Facebook Container for Firefox by bigbubba on Wednesday October 21, 2020 @03:35PM (#24851223)
I can confirm what others are saying, using temporary containers with the default settings left me with hundreds of containers to clean up.
Re:Facebook Container for Firefox by smichel17 on Wednesday October 21, 2020 @07:40PM (#24853509)
I don't remember what the default settings are, but I do remember changing a fair number of them (and they are numerous). Definitely not the most friendly tool to casual use. But when fully configured, it is my second favorite addon (behind uMatrix).
Re:Facebook Container for Firefox by seedcrust on Wednesday October 21, 2020 @03:11PM (#24851015)
I had the same issue and this was always enabled