Use Vim, Emacs, or Sublime Text key bindings in Firefox Developer Tools

In the Editor Preferences section of the developer tools settings, you can choose to use Vim, Emacs, or Sublime Text key bindings instead.

Source: All keyboard shortcuts - Firefox Developer Tools on MDN

As far as I know, there is no way to use Vim keybindings inside Chrome DevTools unfortunately. This may be enough to make me develop against Firefox first more often.