Examine source code of Multi Web Search

{
  "manifest_version": 2,
  "name": "__MSG_extension_name__",
  "short_name": "__MSG_extension_name__",
  "description": "__MSG_extension_description__",
  "author": "Oleksandr Popov",
  "version": "3.7",
  "minimum_chrome_version": "45",
  "offline_enabled": false,
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAk1A6ougzVsFeR7WGNz12xpAK1jlO0/vQZwTb/IufOoQwpN17XiyW/M0We3KX31oZzvn6BCaoQMUrzhV4dY3+qfLrLEzkRGfFJDbxhvN/jQSwN/NXh31iuMeKrIoh3Rqsz/HSLNgKTbbscVrf85p/u1IKdGHwJv8HGydnjyQ+Z0O+0v5KHKBag2Q/98cz7xKHFgpku8tCHTDcyuAOe2WRoEKO0q1R3uJ3s2XLTWSjlFCYphd2XDcl0vx7ZlUtC8SgtsMn/sAz1tPXOw9oJU1wvcFrDpkmwsqRVlwndkhyldpxuw7CUAQbo5sZVzv5PxvHhF1TniszGn546CwRca6ezQIDAQAB",
  "default_locale": "en",
  "applications": {
    "gecko": {
      "id": "s3multiweb@search",
      "strict_min_version": "57.0"
    }
  },
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "__MSG_extension_name__",
      "keyword": "__MSG_extension_name__",
      "search_url": "https://www.s3blog.org/multiwebsearch/search/?s={searchTerms}",
      "favicon_url": "https://www.s3blog.org/files/s3multiwebsearch_16.png",
      "suggest_url": "https://www.s3blog.org/multiwebsearch/suggest/?q={searchTerms}",
      "encoding": "UTF-8",
      "is_default": true
    }
  },
  "browser_action": {
    "default_icon": {
      "16": "skin/s3multiwebsearch_16.png"
    }
  },
  "background": {
    "scripts": [
      "background.js",
      "/content/utils.js",
      "/content/prefs.js",
      "/content/i18n.js",
      "/content/header.js"
    ]
  },
  "options_page": "content/options.html",
  "permissions": [
    "activeTab",
    "contextMenus",
    "storage",
    "tabs",
    "unlimitedStorage",
    "webRequest",
    "webRequestBlocking",
    "http://*/*",
    "https://*/*"
  ],
  "icons": {
    "16": "skin/s3multiwebsearch_16.png",
    "32": "skin/s3multiwebsearch_32.png",
    "64": "skin/s3multiwebsearch_64.png",
    "128": "skin/s3multiwebsearch_128.png"
  }
}