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)
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
: You can customize subtitle styling (font, size, and background) for PiP mode within the browser's accessibility or hidden settings. Recommended Firefox Extensions For sites that don't natively support subtitles or
: PiP subtitles are supported on major platforms like YouTube, Netflix, Disney+, and Prime Video, as well as any site using the WebVTT format. The primary way to use subtitles natively in
The primary way to use subtitles natively in Firefox is through its PiP mode, which allows you to watch videos in a floating window while multitasking.
: To see subtitles in the floating window, you must first enable them in the original video player on the webpage.