[tbb-dev] Intent (Request?) To Remove: privacy.firstparty.isolate.restrict_opener_access

[Tom Ritter]

Back in https://bugzilla.mozilla.org/show_bug.cgi?id=1319773#c20 we
decided to create this pref to allow Tor Browser to relx it's FPI back
to it's old version, which allowed opener access.  As far as I can
tell, there was never a need to do this.

This pref _can_ be used to debug one specific instance of FPi login
failures. But it's also a confusing edge case that it doesn't seem we
need to support anymore.

If I remove it, it will still be present in 60 ESR.

-tom