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.

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

: To see subtitles in the floating window, you must first enable them in the original video player on the webpage.