Examine source code of Emacs Navigation for Firefox

{
  "manifest_version": 3,
  "name": "Emacs Navigation for Firefox",
  "version": "1.0",
  "description": "Use Emacs-like keybinds to navigate webpages",
  "icons": {
    "32": "icons/page-32.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "@emacs-navigation.arrathore",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "tabs",
    "scripting",
    "activeTab"
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "next-line": {
      "suggested_key": {
        "default": "MacCtrl+N"
      },
      "description": "Move down a little"
    },
    "previous-line": {
      "suggested_key": {
        "default": "MacCtrl+P"
      },
      "description": "Move up a little"
    },
    "scroll-up-command": {
      "suggested_key": {
        "default": "MacCtrl+V"
      },
      "description": "Scroll the page up almost one screen"
    },
    "scroll-down-command": {
      "suggested_key": {
        "default": "Alt+V"
      },
      "description": "Scroll the page down almost one screen"
    },
    "forward-char": {
      "suggested_key": {
        "default": "MacCtrl+F"
      },
      "description": "Move to the right a little"
    },
    "backward-char": {
      "suggested_key": {
        "default": "MacCtrl+B"
      },
      "description": "Move to the left a little"
    }
  }
}