If you're willing to install an addon, there is: https://addons.mozilla.org/en-US/firefox/addon/autoreaderview/ https://addons.mozilla.org/en-US/firefox/addon/a

If you're willing to install an addon, there is: https://addons.mozilla.org/en-US/firefox/addon/autoreaderview/ https://addons.mozilla.org/en-US/firefox/addon/autoreadervie... (I'm in no way affiliated with the author of the addon, nor do I use it — with Vimperator, I'm just a "gr" away from reader mode anyway.)