What I would love to see are vim-way shortcuts. 

E.g. 'j' and 'k' to move between lines. 

Worth a look is a chrome extension called vimium.

And I know, that for people not familiar with vim this may be a pain too learn a new way of using shortcuts, so i guess this could be just an option or a 'shortcut profile'.

Anyway, I love this extension! With productivity of vim it could become one of the most powerful extensions for web browsing ;)