Try to add a javascript bookmark to your toolbar, like Readability :
http://lab.arc90.com/experiments/readability/

Then clic on the newly created bookmark :

Problem occurred while loading the URL http://javascript:(function(){readStyle='style-newspaper';readSize='size-large';readMargin…


The problem is that now the bookmark automatically add "http://" to the URL.

It was working with Epiphany-gecko