Examine source code of Focus

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "version": "1.4.0.1resigned1",
  "default_locale": "en_US",
  "description": "__MSG_extensionDescription__",
  "author": "Daniel Arthur Gallagher",
  "icons": {
    "16": "16.png",
    "20": "20.png",
    "25": "25.png",
    "30": "30.png",
    "32": "32.png",
    "40": "40.png",
    "42": "42.png",
    "48": "48.png",
    "50": "50.png",
    "64": "64.png",
    "70": "70.png",
    "90": "90.png",
    "120": "120.png",
    "128": "128.png",
    "150": "150.png",
    "210": "210.png",
    "256": "256.png",
    "270": "270.png",
    "512": "512.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.stackoverflow.com/questions/*",
        "*://*.stackexchange.com/questions/*",
        "*://serverfault.com/questions/*",
        "*://superuser.com/questions/*",
        "*://askubuntu.com/questions/*",
        "*://stackapps.com/questions/*",
        "*://mathoverflow.net/questions/*"
      ],
      "css": [
        "hide-sidebar.css"
      ]
    }
  ],
  "content_security_policy": "default-src 'none'; style-src 'self'; script-src 'self'; object-src 'none'",
  "developer": {
    "name": "Daniel Arthur Gallagher"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b309e000-4f53-4dd5-aa17-4904e34a4ae5}"
    }
  }
}