Examine source code of Yahoo Search Addon

{
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "Yahoo",
      "keyword": "Yahoo",
      "search_url": "https://search.yahoo.com/yhs/search?p={searchTerms}&hsimp=yhs-102&hspart=mozilla&type=dss",
      "favicon_url": "https://www.yahoo.com/favicon.ico",
      "is_default": true
    }
  },
  "manifest_version": 2,
  "name": "Yahoo Search",
  "description": "See search differently. Set your search engine to Yahoo! This extension automatically sets Yahoo as your default search engine.",
  "version": "1.0.1resigned1",
  "permissions": [
    "storage",
    "*://*.yahoo.com/*",
    "webRequest",
    "webRequestBlocking",
    "cookies"
  ],
  "applications": {
    "gecko": {
      "id": "@yset",
      "strict_min_version": "55.0"
    }
  },
  "background": {
    "scripts": [
      "TrackingEncoder.js",
      "TrackingManager.js",
      "LogManager.js",
      "Constants.js",
      "BrowserGap.js",
      "index.js"
    ]
  },
  "icons": {
    "64": "icons/Y_NT64.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.yahoo.com/*"
      ],
      "js": [
        "notifyPresence.js"
      ]
    }
  ]
}