Tube Sub Export
Adds download button for subscription list in xml format.
What is Tube Sub Export?
Tube Sub Export is a Firefox add-on that adds a download button to the youtube.com/feed/channels page. It allows users to export their subscribed channels as an XML file, similar to how it used to work in Subscription Manager. The add-on is open-source and can be found on GitHub.
Adds a download button to the youtube.com/feed/channels page. It exports the listed channels as an XML, in a fashion it used to work in Subscription Manager. You have to log in to your Google account beforehand, of course.
It's open-source, you can have a look at what's under the hood: github.com/ajohntom/tube-sub-export
Tube Sub Export may not be safe to use and it requires some risky permissions. Exercise caution when installing this add-on. Review carefully before installing.
Tube Sub Export has earned a fairly good reputation and likely can be trusted.