This attribute is super buggy, always loads the remote frame in the same remote type ("web"), and doesn't test the actual codepaths which we use to make a frame become remote in fission. It would be good to remove it to ensure that tests written actually test the code we use in fission.

Unfortunately, as we don't run fission tests on infra yet, this is often the easiest way we have to write a test which tests fission without falling back to a browser chrome test, so people are still wanting to use it.

https://hg.mozilla.org/mozilla-central/rev/90aa4f9a583c

Retroactively moving fixed bugs whose summaries mention "Fission" (or other Fission-related keywords) but are not assigned to a Fission Milestone to an appropriate Fission Milestone.

This will generate a lot of bugmail, so you can filter your bugmail for the following UUID and delete them en masse:

0ee3c76a-bc79-4eb2-8d12-05dc0b68e732