simple addon https://addons.mozilla.org/en-US/firefox/addon/awesome-rss/reviews/?utm_content=search&utm_medium=referral&utm_source=addons.mozilla.org

Kind of does what it needs to do. I would like it better if it copied the url of the RSS/Atom feed instead of tried to open or download it.

now i need to use Vivaldi for this

maybe something like StreetPass mastodon for RSS/Atom