Examine source code of Happy && Snappy

{
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "manifest_version": 2,
  "version": "0.160",
  "default_locale": "en",
  "icons": {
    "64": "icon.svg",
    "128": "icon.svg"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>",
    "*://*/*",
    "storage",
    "privacy",
    "downloads"
  ],
  "background": {
    "page": "background.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content_script.js"
      ],
      "all_frames": false,
      "run_at": "document_start"
    }
  ],
  "page_action": {
    "browser_style": true,
    "show_matches": [
      "*://*/*"
    ],
    "default_icon": {
      "19": "icon.svg",
      "38": "icon.svg"
    },
    "default_title": "Happy Snappy",
    "default_popup": "pages/popup.html"
  },
  "options_ui": {
    "page": "pages/options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{40430687-6d3f-4d81-836c-e7aebe01bba3}"
    }
  }
}