Examine source code of NicoOpener

{
  "applications": {
    "gecko": {
      "id": "nico-opener@tor4kichi"
    }
  },
  "author": "tor4kichi",
  "background": {
    "page": "background.html",
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "*://twitter.com/*"
      ],
      "js": [
        "TwitterTimelineInject.js"
      ],
      "run_at": "document_start"
    }
  ],
  "icons": {
    "16": "assets/icons/nicoopener-icon-black-16.png",
    "48": "assets/icons/nicoopener-icon-black-48.png",
    "128": "assets/icons/nicoopener-icon-black-128.png"
  },
  "default_locale": "ja",
  "description": "__MSG_extensionDescription__",
  "homepage_url": "https://github.com/tor4kichi/NiconicoOpener",
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "page_action": {
    "default_icon": {
      "19": "assets/icons/nicoopener-icon-19.png",
      "38": "assets/icons/nicoopener-icon-38.png"
    },
    "default_title": "Nico Opener",
    "default_popup": "popup/NiconicoPageAction.html"
  },
  "permissions": [
    "http://*/*",
    "https://*/*",
    "tabs",
    "contextMenus",
    "webNavigation",
    "activeTab"
  ],
  "version": "1.0.4resigned1",
  "web_accessible_resources": [
    "assets/icons/button-nicoopener-icon.png"
  ],
  "-ms-preload": {
    "backgroundScript": "backgroundScriptsAPIBridge.js",
    "contentScript": "contentScriptsAPIBridge.js"
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  }
}