Firefox used to discover RSS links on web pages and display an icon next to the URL I believe, It is one of the many features that was removed over the years.

Firefox used to discover RSS links on web pages and display an icon next to the URL I believe, It is one of the many features that was removed over the years. Also I wish that https://apnews.com/ https://apnews.com/ had an RSS feed (I know that you can create a feed from it using 3rd party services).