So, for example, I use a plugin called Tridactyl in Firefox. It allows me to select any link, any button, or enter any text box in just a few keystrokes. I hit one key to tell it "I want to click something", essentially, at which point it highlights the links & assigns them letters; then I type the letters corresponding to my choice. It's competitive with the mouse.

Firefox isn't too bad without extensions, either, since it has the ' key. (Find, but restricted to links. So, ' + type the link text until match + Enter.)

My work keyboard also has keycombos that I can turn a few of the keys into a crude mouse, but it is so slow that it's usually not worth it.