I created this addon:
Feed & RSS-bridge helper
It will generate RSS-bridge feeds for the current URL (i.e. for a youtube channel from a video, or a twitter user from their timeline). It also will display native feeds for a page via the link element. If you use TT-RSS, it can also integrate to subscribe to a feed easily.
Fosstodon is an English speaking Mastodon instance that is open to anyone who is interested in technology; particularly free & open source software.