If I could only have one extension, this would be the one.

It sometimes clashes with existing page shortcuts, but it pays off to reconfigure it until it works perfectly.

very useful because my mouse wheel is broken, also very productive

On Firefox it has a severe bug while searching: often it doesn't allow writing more than one character during search. It makes me switch to another vimium extension.

Amazing extension. The only thing stopping it from getting five stars is that it doesn't work on all web pages.