How to change key-bindings in firefox?

Question

Firefox constantly keep moving platformHTMLBindings.xml when it upgrade.
I want to replace it to support vi key-bindings. But I cannot find it any more.

sudo find / -name platformHTMLBindings.xml -o -name toolkit.jar -o -name omni.jar

Thanks for your help.

Edit:

I finally found it. It's called omni.ja now.

---

This is my editing to platformHTMLBindings.xml:

  <binding id="browser">
    <handlers>
      <handler event="keypress" key=" " modifiers="shift" command="cmd_scrollPageUp" />
      <handler event="keypress" key=" " command="cmd_scrollPageDown" />

      <handler event="keypress" key="k" command="cmd_scrollLineUp" />
      <handler event="keypress" key="j" command="cmd_scrollLineDown" />
      <handler event="keypress" key="h" command="cmd_scrollLeft" />
      <handler event="keypress" key="l" command="cmd_scrollRight" />

After Editing, I restart firefox, and clear the cache.
chrome://global/content/platformHTMLBindings.xml is correct.
But the j/k/h/l shortcuts didn't work.

Solution

I have to disable/enable an add-on to reload /usr/lib/firefox/omni.ja.

Comments

[Admin]

Submit it as an answer instead of comment if your question is solved so that people knew that it is answered.

[Admin]

@mac Haven't solved yet. Because after changing platformHTMLBindings.xml, nothing happened.

[Admin]

Now if you change omni.ja, Firefox recognizes this and says that it needs to restart

[Admin]

@kev where did you find commands like cmd_scrollLineUp from?

[Admin]

@hatter I use vimperator now. It works very well!

[Admin]

@kev I just needed this 'jk-scrolling' functionality. I didn't need all of Vim's keybindings. So this question exactly catered my need.

[Admin]

@hatter You can read this doc: kb.mozillazine.org/Emacs_Keybindings_%28Firefox%29

[Admin]

But this solution has a problem. omni.ja is not preseved across Firefox updates.

[Yaroslav Nikitenko]

The first addon no longer works with new Firefox. From addon's page: "Unfortunately, WebExtensions (the new API for Firefox 57+) does not have the functionality for the correct operation of this addon in Firefox. So this addon will no longer work with the release of Firefox 57 in November 2017! This is the inevitable change in Firefox - all Xul-addons will die out in Firefox 57" addons.mozilla.org/en-US/firefox/addon/s3menu-wizard