Any browser extension that lets you highlight text on web pages, persists to a centralized server, and lets you see what other people have highlighted[0] in a w

Any browser extension that lets you highlight text on web pages, persists to a centralized server, and lets you see what other people have highlighted[0] in a way that indicates highlighting popularity[1] would enable crowd-sourced "TLDR" for the entire web. YouTube shows transcripts - though admittedly created through speech-to-text - for videos. (Click the ellipsis next to "SAVE", then "Open Transcript".) It may be more realistic to get a critical mass of TLDRs if the service is more general, as I've described above. But there's nothing preventing YouTube-specific functionality, or even a YouTube-specific browser extension, powered by the same backend. [0] Anonymized, of course. [1] As a simple example, a #fff (white) background for passages that nobody has highlighted, through a #ff0 (brightest yellow) background for the most popularly highlighted passages.