title: "emacs" key bindings for Firefox 46
body: <p>I've been happily using Firefox in Kubuntu 14.04, with "emacs" key bindings, by adding tho the <code>~/.gtkrc-2.0</code> file:</p>
  
  <pre><code>gtk-key-theme-name = "Emacs"
  </code></pre>
  
  <p>However, now Firefox has been updated to 46, apparently with GTK3 (and, as with every second update, some other settings/extensions are screwed up), and that solution doesn't work. How can I easily get my Ctrl+U = "clear line" shortcut?</p>