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ForgottenSeer 85179
Remember that Firefox's sandbox is still substantially weaker (especially on Linux, where it can hardly be considered a sandbox at all) then Chromium based browser and lacks support for isolating sites from each other rather than only containing content as a whole.then use FPI (First Party Isolation) + Containers
So if one exploit Firefox itself, then all of your content would be not secure as it's not isolated.
That's why Chromium based browser have (strict) site isolation which also protect against sidechannel attacks too.