use keyNames to check backspace keyCode
use keyNames to check backspace keyCode

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