Re-buffering happens if you replay a video after it buffers completely till the end and if you click on the timeline far enough back during buffering.
I’ve looked through many threads but didn’t find any fix/workaround for this. I saw some users saying changing values for media.cache_readahead_limit and media.cache_resume_threshold to 99999 fixed it but that didn’t help and actually caused Firefox to stop buffering midway through videos.
Nope. That’s one of the ways Google intentionally disadvantages browsers other than Chrome.
Install a user agent switcher and set it to the most recent Chrome agent string. You’ll probably see a long of jank go away…