Are you setting this option to something else?
Temporary Containers works really well for me. I have per domain isolation, which only breaks very very few sites (Gmail and Outlook 365). For those I have regular persistent containers. Alternatively, I can always open a new private window where I don't have this plugin active.
uBlock Origin + Temporary Containers + ClearURLs are a great setup for privacy and security. Actually, I don't need much else aside from a VPN and a few settings in my user.js.
The only thing I miss is Vimperator. Modern alternatives are full of glitches because of inherent limitations in the WebExtensions API.
There are related issues opened for Temporary Containers, MAC and Firefox and at least from the public discussions not much is happening about it.
Didn't use Vimperator, but I found Tridactyl to be pretty good, especially their hinting mode.
Are you sure you didn't accidentally change it?
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`.
import json
with open('containers.json.bac') as f:
s = f.read()
j = json.loads(s)
ids = [i for i in j['identities'] if not i['name'].startswith('tmp')]
print(len(j['identities']), len(ids))
j['identities'] = ids
with open('containers.json', 'w') as wf:
wf.write(json.dumps(j))Just go to about:debugging, click on "This Firefox", locate the extension and click the "Inspect" button. In the case of MAC this should lead you to about:devtools-toolbox?type=extension&id=%40testpilot-containers
In the devtools that open you need to go to the Console tab and run this command:
await browser.storage.sync.clear()
await browser.storage.sync.get()At least this way yo won't end up with unusable FF because of the thousands of undeletable temporary containers.
I used to delete manually each container when this happened, through about:preferences container manager, but now there is no more this in Preferences and to remove containers through the Multi-Container extension isn't the best thing.
Tried do that by editing some files too but the hundreds os containers keep reappearing after few days, or on new installations.
This extension to Multi-Account Containers looks great at first -- its Automatic mode spins up a new container each time you open a new tab, then switches that tab to an existing container, should one be associated with the TLD you visit.
The problem is that Temporary Containers does not delete these temporary containers. They accumulate in the MAC containers list. There is no way to mass delete them, nor set them to auto-delete when the tab is closed.
These WILL sync to your Firefox account and reappear on every machine. Over 3000 temp container made MAC unusably laggy. This was so destructive of my MAC experience that I uninstalled both extensions. Unfortunately, to my knowledge, there is no way to reset the data MAC syncs to Firefox Account.