: PiP subtitles are supported on major platforms like YouTube, Netflix, Disney+, and Prime Video, as well as any site using the WebVTT format.
While Mozilla Firefox does not have a built-in "Live Caption" feature that automatically generates text from audio like Google Chrome, it offers robust support for English subtitles through its mode and third-party extensions . Native Subtitle Features Firefox subtitles English
For sites that don't natively support subtitles or for more advanced features, you can use specialized extensions from the Firefox Add-ons store : Add Subtitles – Get this Extension for Firefox (en-US) : PiP subtitles are supported on major platforms