Bug
1807545 - Add new "Open in regular tab" feature.
This feature allows a private tab to be reopened as a regular tab. The
feature is only enabled for users with the "Open links in a private tab"
option enabled - such users who follow links from external applications
will always have these tabs opened as private, so may wish to "opt-out"
of individual tabs being private.
Users without this option set will not have private tabs opened by
default, so have already opted-in to each private tab - thus, those users
are unlikely to benefit from this feature.
The feature is added to the main menu - however, as above, it will only
be visible when a private tab is open *and* "Open links in a private tab"
is enabled, so will only be seen by a minority of users.
The feature is also enabled only for Nightly while it is polished, but
the intention is that it eventually ride to release.