Helvetireader, ported by Dave Fayram
The original userscript is by Hicksdesign. If you’re a fan of simple, Helvetica-laced design and hate the idea of using an input manager to run GreaseKit, this one’s for you.
EDIT: If you’d rather read the code and build the extension yourself, check out Ronny Haryanto’s GitHub repository.
(Submitted by Tom Pope.)