Examine source code of CleanKinja

{
  "manifest_version": 2,
  "name": "CleanKinja",
  "version": "2.10",
  "browser_specific_settings": {
    "gecko": {
      "id": "jid1-FVQIFAKPn86JXg@jetpack"
    }
  },
  "description": "Adds a degree of separation between the Gawker sister sites",
  "content_scripts": [
    {
      "matches": [
        "*://*.kotaku.com/*",
        "*://*.gawker.com/*",
        "*://*.gizmodo.com/*",
        "*://*.jezebel.com/*",
        "*://*.deadspin.com/*",
        "*://*.lifehacker.com/*",
        "*://*.jalopnik.com/*",
        "*://*.theroot.com/*",
        "*://*.fusion.kinja.com/*",
        "*://*.splinternews.com/*",
        "*://*.avclub.com/*",
        "*://*.earther.com/*",
        "*://*.thetakeout.com/*",
        "*://*.theinventory.com/*",
        "*://*.theonion.com/*",
        "*://*.clickhole.com/*"
      ],
      "js": [
        "cleankinja.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "storage"
  ]
}