Examine source code of WebRequestBlock

{
  "name": "WebRequestBlock",
  "description": "指定したURLでの指定したURLのRequestをBlock",
  "manifest_version": 2,
  "version": "1.2.4resigned1",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "tabs",
    "storage",
    "*://*/*"
  ],
  "icons": {
    "48": "img/48x48.png",
    "96": "img/96x96.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "false.png",
    "default_title": "webRequestBlock",
    "default_popup": "popup/popup.html"
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ca5281cc-2640-4aed-85b3-cfe07f6f9132}"
    }
  }
}