ESR128: check userActivation is sanitized
just a reminder to follow up on
links
- https://groups.google.com/a/mozilla.org/g/dev-platform/c/YpjKfr4MQIE/m/jAAp63vlAgAJ
- https://bugzilla.mozilla.org/show_bug.cgi?id=1791079
- https://html.spec.whatwg.org/multipage/interaction.html#the-useractivation-interface
pretty sure PB windows clear this per private session. Seems fairly useless for aiding linkifying (if persisted across sessions)
cc: @ma1