Uhhh that would involve a mouse, gross ; )
On unfamiliar codebases a mouse with back and forward buttons can be quite a fast and convenient way to get the "lie of the land".
I often do this inside GitHub's browser-based editor.
Yes, using the vimium extension. My only problem is text inputs like this one, my muscle memory expects vim keys to work and I type a lot of jibberish that I have to clean up. I know there are extensions for that too but I can live with it.
(I use a Superior Technologies trackball because it's the only mouse I could find manufactured in the USA and it's really not very precise, it's kind of a self handicap to nudge me towards keyboard shortcuts, muscle memory gains just have a steeper curve on keyboard than mouse)
With the keyboard there is no such coordination, I simply think the thing i want to happen and press the appropriate keys.