The extension is quite useful, moreover it allows you to actually download a page in PDF

Customizable reader mode, 'nuff said.
Basically what Firefox used to have before they removed it.

It's a definite improvement on Firefox's own reader view, and very customizable.

I have some vision problems and this add-on really helps.

I also use this to quickly convert articles into pretty looking documents that I can print, or save as PDF for my e-reader.

Best tool for reading view

7

This is the best readability add-on for Firefox at the moment - it's reliable (doesn't remove the full article LOL, like for instance the Clearly Reader add-on does), its editor funcitonality is top-notch, and the default reader layout is just beautiful and calming.

I was searching for alternatives to default Reader Mode of Firefox browser because on forum Sufficient Velocity it works in a really wonky way making it completely unusable. There is some weird interaction with "Threadmark" function of Sufficient Velocity forum that causes (Default) Reader Mode to fetch text from always the wrong post (either last or the next one).
This addon solves that problem thanks to option to manually direct the source of fetched data through highlighting the correct post bypassing the weird interactions. Exactly what I was looking for!

A beautiful ad-don. It's my aha moment for the day.