UPDATE 2024-01 - Did not seem to work: Used tomp3.cc to capture from YouTube in 2023-02.
Used https://github.com/yt-dlp/yt-dlp - has Windows binaries for YouTube and a Vimeo video.
Vimeo came as 2 MP4 files, one video one audio. To recombine?
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Some notes on saving Flash videos from the web from many sites.
Generally:
Firefox - go to "about:cache" to get the temporary folder location.
Use Hobocopy to copy the biggest file, which is probably the Flash FLV with a .tmp filename.
http://www.walkernews.net/2007/11/19/how-to-save-flash-video-from-firefox-cache-folder/
tags: youtube, video, flash, capture, save, rip