"Main idea behind the extension is to add close captions or subtitles to videos on the Internet; this may be useful to add subtitles to a video that comes without any, use different language subtitles, or closed captions. The extension supports the two formats .srt and .vtt at the time of writing, and HTML5 video elements on webpages." https://www.ghacks.net/2020/02/08/u...latest-extension-ccaptioner-is-now-available/ https://addons.mozilla.org/en-US/firefox/addon/ccaptioner/
Admittedly I'm tired. But this adds subtitles to videos that don't have them? Like reversing text to speech?
