@robehr79 Thanks for the quick follow-up !
In my experimentations, the length of the URL has to be as big as the input to trigger the flickering. With a small URL, everything is fine.
@clorith
Requesting reopening this again, as it has gone nowhere at the moment and it seems somehow critical:
post editors with a Firefox browser have to stop editing the page as soon as they try to edit a link in TinyMCE, as this flickering unallow them to click anywhere on the admin editor.
It may affect all WordPress 6.x released. Please give it a follow up. Thanks !
