How does a YouTube movie downloader work? - YouTube

Question

I\'m wordering how apps such as Video DownloadHelper work.

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Any ideas?

Answer 1

Looking at the extension code, you can see it's doing it by regex parsing HTTP responses for various content types. The code is located in network-probe.js.

Specifically its using the http-on-examine-response event in the Firefox addon sdk - https://developer.mozilla.org/en-US/docs/Observer_Notifications#HTTP_requests