Hacker News Reader

I am using the RSSPreview [1] Addon in Firefox, which works for me also on Youtube. The addon brings back the nice RSS Icon in the URL Bar. You can also change to color back to orange so you can spot it easily when a site has an RSS feed.

[1] https://addons.mozilla.org/en-US/firefox/addon/rsspreview/

If you give a channel URL to NetNewsWire, it will figure it out for you. I definitely recommend it, it's the golden standard of RSS readers.

To get the YouTube channel Id: on the channel home page (you may need to reload the page or open it in private mode to avoid caching), open the developer console and enter:

ytInitialData.metadata.channelMetadataRenderer.externalId