[Merge] ~osomon/ubuntu-seeds/+git/ubuntu:impish-desktop-firefox-snap into ~ubuntu-core-dev/ubuntu-seeds/+git/ubuntu:impish

[Brian Murray]

I'll go ahead and merge this now given that builds are failing but I believe the documentation in the wiki page isn't entirely accurate and that we'd want to move firefox to supported-desktop-extra.
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https://code.launchpad.net/~osomon/ubuntu-seeds/+git/ubuntu/+merge/408825
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