Examine source code of ITA Matrix Powertools

{
  "manifest_version": 2,
  "name": "ITA Matrix Powertools",
  "version": "0.55.4",
  "description": "Adds new features and builds fare purchase links for ITA Matrix",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "64": "icons/icon64.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://matrix.itasoftware.com/*",
        "*://oldmatrix.itasoftware.com/*",
        "*://newmatrix.itasoftware.com/*"
      ],
      "js": [
        "webext.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "ita-matrix-powertools.user.js"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{adc96546-ad4d-4b76-9df3-84cdd73af6fa}"
    }
  }
}