Hi BobbyO, have you modified any settings related to that message? Here's where you can check on that and make changes: (1) In a new tab, type or paste '''about:config''' in the address bar and press Enter/Return. Click the button accepting the risk. ''More info on about:config:'' [[Configuration Editor for Firefox]]. ''The moderators would like us to remind you that changes made through this back door aren't fully supported and aren't guaranteed to continue working in the future.'' (2) In the search box in the page, type or paste '''full-screen-api.warning''' and pause while the list is filtered - Firefox should list two preferences (3) Double-click the '''full-screen-api.warning.delay''' preference to display an editing field, and change the value to '''0''' then press Enter or click the blue check mark button to save the change. (4) Double-click the '''full-screen-api.warning.timeout''' preference to display an editing field, and change the value to '''0''' then press Enter or click the blue check mark button to save the change. '''Sometimes 0 is too short and the message gets stuck. In that case, try 20 or another small value.''' Any improvement?