In Vimium, is there something like f for input fields? E.g. in a form with 10 input fields, I directly want to jump to the 5th, instead of only gi and tabbing through. Is that possible using Vimium?
Yes, as in many shortcuts in vim you can prefix a command with a number. I.e. to jump to the 5th field you type 5gi.
Other vim style examples (It isn't related to vimium. I included it only to illustrate the approach):
3dd delete 3 lines2j go up 2 lines5p paste the buffer 5 times