Rework #2223 (backspace).
Rework #2223 (backspace).

poacher2k/vimium,gdh1995/vimium,mrmr1993/vimium,philc/vimium,gdh1995/vimium,poacher2k/vimium,mrmr1993/vimium,willsALMANJ/vimium,philc/vimium,gdh1995/vimium,poacher2k/vimium,decaffeinate-examples/vimium,smblott-github/vimium,smblott-github/vimium,willsALMANJ/vimium,decaffeinate-examples/vimium,willsALMANJ/vimium,decaffeinate-examples/vimium,philc/vimium,smblott-github/vimium,mrmr1993/vimium