At the very least allow us to add exceptions for websites, I don't need to be bloody told that I've entered Fullscreen Mode on Youtube when explicitly telling it I want to watch a fucking video in full screen! It's a redundant warning in that situation!

There wasn't a way to add site specific exceptions before, which is likely why you saw a lot of people disabling this safety measure completely, and there still is no way to have site specific disabling of the warning.

See:

• bug 1160017 - Get rid of permission for DOM fullscreen

Please do not comment in bug reports
https://bugzilla.mozilla.org/page.cgi?id=etiquette.html

Note comment 26 in that bug report, it reflects my feelings on the change. Please add site-specific exceptions that prevent the fullscreen warning from ever appearing when something on a specified website tries to enter a fullscreen mode.

We are Firefox users just like you.

You can leave your feedback and comments via Help > Submit Feedback

• http://input.mozilla.com

Migrated my feedback to there, thanks.