Strange message appears in a box on screen whenever a video plays
Whenever I play a video, I get a strange box appear on screen that I can't get rid of (I've included a picture). I'm thinking I might have accidentally hit some strange combination of keys on my keyboard, but it happens every time. Any suggestions?
Oh, that is very broken. Recent versions of Firefox display a small blue icon on the right side of the player for picture-in-picture. Something seems to be wrong with that icon on yours. If you don't use this feature, you could disable it here:
(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button accepting the risk.
(2) In the search box in the page, type or paste videocon and pause while the list is filtered
(3) Double-click the media.videocontrols.picture-in-picture.enabled preference to switch the value from true to false
More info on about:config: Configuration Editor for Firefox.
Alternately, if you want to get that feature working, I would lean toward replacing the program files, but perhaps someone else has an easier idea. (Before doing anything drastic, I suggest backing up your data: Back up and restore information in Firefox profiles)
What Firefox locale do you use in case your current locale is broken ?
- Options/Preferences -> General -> Language:
Choose the languages used to display menus, messages, and notifications from Firefox.
Are you using a language pack that provides string translations for the user interface?
You can try to reinstall Firefox on top of the current installation.