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> that's the only conceivable useful difference over Containers

Actually, I have wanted better profile support for a while to segregate addons. There are plenty of addons that I want to use occasionally that require full data access. I generally do trust them, but even so, I keep these in a separate profile just in case. That is something that can't be done with containers.

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> There are plenty of addons that I want to use occasionally that require full data access. I generally do trust them...

Seconded, except I don't trust most add-ons and don't want to have to trust them.

I want an easy way to launch a disposable browser session in any browser, totally isolated, with add-ons chosen (and downloaded) at launch time, and then erased of with the rest of the session when its last open page is closed.

I think Firefox focus does that on android, I'm sure there's a way to get the same result on a desktop with some flags and pointing to a config file (or a read only profile folder maybe?)

AFAIK Firefox Focus doesn't have extensions at all:( Although yes, it effectively has only private/incognito sessions that are erased when you close the app.

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