Privacy securityLetterBoxADVAhmadPatch for the letterboxing bypassing vulnerability https://github.com/a7maadf/Bypass-LetterBoxing https://bugzilla.mozilla.org/show_bug.cgi?id=1788839 The addon is completely open-source: https://github.com/a7maadf/LetterBoxingADVScreenshots from Mozilla Add-ons