FireFox version of Safari "text only"? I find the "text only" option in Safari - you know, those lines to the left of the URL bar - extremely useful on my iPhone and iPad. However on my Windows laptop for work, I use FireFox and would really, really like that feature. I know I could use third-party apps like Pocket and the like but frankly I would like something "built-in" which doesn't require bloatware. 

On a side-note, does this feature have a particular name?
Firefox has no built-in reader feature. But you can install an extension to add this feature : Reader for Firefox