Examine source code of Stackblocker

{
  "manifest_version": 2,
  "name": "Stackblocker",
  "version": "1.0",
  "description": "This blocks the individual elements of the sidebar on Stack Overflow (and adjacent sites)",
  "icons": {
    "48": "icons/border-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://stackoverflow.com/*",
        "*://*.stackoverflow.com/*",
        "*://*.stackexchange.com/*"
      ],
      "js": [
        "stackblocker.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": {
      "48": "icons/border-48.png"
    },
    "default_popup": "options/options.html",
    "default_title": "SO Block Options"
  },
  "permissions": [
    "storage"
  ],
  "applications": {
    "gecko": {
      "id": "thomsonjack41@gmail.com"
    }
  }
}