Examine source code of Tris

{
  "name": "__MSG_appName__",
  "description": "__MSG_appDesc__",
  "short_name": "Tris",
  "version": "0.9.87resigned1",
  "manifest_version": 2,
  "homepage_url": "https://www.tris.com",
  "default_locale": "en",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "background": {
    "scripts": [
      "js/socketcluster.js",
      "js/background.js"
    ],
    "persistent": true
  },
  "permissions": [
    "tabs",
    "http://*/*",
    "https://*/*",
    "storage",
    "contextMenus"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/button16.png",
    "default_title": "Tris"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "js/content_scripts.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "frame.html"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{D6A3FDD1-92C8-4815-AAF3-5E6FC813754E}"
    }
  }
}