Examine source code of Tab Group

{
  "manifest_version": 2,
  "name": "Tab Group",
  "version": "1.1",
  "description": "Group important Tabs to reduce many tabs on screen.",
  "homepage_url": "https://github.com/Ogwenya/tab-group",
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "permissions": [
    "tabs",
    "contextMenus",
    "bookmarks"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/icon.svg"
    },
    "default_title": "Tab Group",
    "default_popup": "popup.html"
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+A",
        "mac": "Command+Shift+A"
      },
      "description": "Open the Tab Group popup"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e79ca81c-faee-4cc6-8c4d-e445b278f688}"
    }
  }
}