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Strange message appears in a box on screen whenever a video plays

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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?

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?
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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

Any improvement?

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)

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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.