Reader view doesn't always work though (at least in Firefox.) You can use the icon in the URL bar or CTRL + ALT + R to open reader view.
Firefox does some detective work to choose whether to show the reader view icon but using the keyboard shortcut used to work regardless. Recently it seems even the keyboard shortcut doesn't work unless the icon is visible - I think becausethe heuristic for showing the icon is more accurate these days.
https://add0n.com/reader-view.html
It's great for these situations.