Hacker News Reader

Related: Firefox still offers an RSS button that you can place in a toolbar. Lights up when a site has a feed available.

Also related: if your browser can not do this, view source, and look for a <link> with rel=alternate.

Chrome also has an official extension (by Google) to do the same:

It can be configured to send the selected feed URL to your (online) aggregator of choice.

Medium has them too [0]: medium.com/feed/@Medium

Plus Blogger [1]: blogname.blogspot.com/feeds/posts/default?alt=rss

Yeah, even in 2018, sites I encounter without RSS are few and far between.

Also just /feed/ usually works.