Firefox 57 and lost some shortcuts on mac

There was an old plugin called Customizeable Shortcuts that hadn't been updated for while and was not usable with Firefox 57. I was using it to remap the 'search location bar' shortcut.

Since I already use karabiner to remap some modifier keys for macos, it might be able to use it instead of waiting for a new firefox shortcut addon.

Note: If you're confused by the left_option/left_command it's cause I've first remap left_command to left_option.

1) Have a look at some of the examples for karabiner shortcuts
https://pqrs.org/osx/karabiner/complex_modifications/#key_specific

2) Create a json and take note of the path

{
  "title": "Firefox command-d search location",
  "rules": [
    {
      "description": "command-d search location",
      "manipulators": [
        {
          "type": "basic",
          "from": {
              "key_code": "d",
              "modifiers": {
                  "mandatory": ["left_option"],
                  "optional": ["any"]
              }
          },
          "to": [
              {
                "key_code": "l",
                "modifiers": [
                  "left_command"
                ]
              }
          ],
          "conditions": [
            {
              "type": "frontmost_application_if",
              "bundle_identifiers": [
                "^org\\.mozilla\\.firefox"
              ]
            }
          ]
        }
      ]
    }
  ]
}

I saved this to my desktop with the name firefox-command-d.json

What is going on? frontmost_application_if only runs the above shortcuts if it's the app focused.
bundle_identifiers is your app id that you can find in the plist.

3) Now run enter this in the url bar in firefox: karabiner://karabiner/assets/complex_modifications/import?url=file:///Users//Desktop/firefox-command-d.json

Enable this and you have your remap.