Summary: To cut to the chase, the segment of interest is 4:07 to 8:23, as noted here; the video itself is hard to find any longer, even in official channels
Given Mozilla's utterly rubbish marketing these days (politics over technical aspects), set aside the cheerleading for slop, there's hardly a chance of Mozilla Firefox reaching or exceeding 10% again
"before that, every distro that wanted to respect its users' freedom had to remove itself all of the binary blobs that were distributed as part of the kernel Linux's so-called sources"