Examine source code of Tabs Controls Shortcuts

{
  "author": "Akhil Gupta",
  "manifest_version": 2,
  "name": "Tabs Controls Shortcuts",
  "version": "1.0.2",
  "description": "A simple extension to control tab(s) via keyboard.",
  "homepage_url": "https://github.com/aklgupta/FirefoxTabControlsShortcutExtension",
  "icons": {
    "16": "icon.svg",
    "32": "icon.svg",
    "48": "icon.svg",
    "64": "icon.svg",
    "96": "icon.svg",
    "128": "icon.svg"
  },
  "permissions": [
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "commands": {
    "move-left": {
      "suggested_key": {
        "default": "Alt+Shift+Left"
      },
      "description": "Move Tab(s) Left"
    },
    "move-right": {
      "suggested_key": {
        "default": "Alt+Shift+Right"
      },
      "description": "Move Tab(s) Right"
    },
    "move-start": {
      "suggested_key": {
        "default": "Alt+Shift+Up"
      },
      "description": "Move Tab(s) to the Start"
    },
    "move-end": {
      "suggested_key": {
        "default": "Alt+Shift+Down"
      },
      "description": "Move Tab(s) to the End"
    },
    "duplicate-tab": {
      "suggested_key": {
        "default": "Alt+Shift+D"
      },
      "description": "Duplicate Tab(s)"
    },
    "toggle-pin": {
      "suggested_key": {
        "default": "Alt+Shift+P"
      },
      "description": "Pin/Unpin Tab(s)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a0cf227b-cf35-43a3-bda5-0460452abffc}"
    }
  }
}