Examine source code of Cloudicon

{
  "manifest_version": 2,
  "name": "Cloudicon",
  "version": "1.0",
  "description": "Replaces favicons for Cloudticity tools so pins are usable again",
  "icons": {
    "48": "media/icon.png"
  },
  "permissions": [
    "tabs",
    "*://oxygen-v2.cloudticity.com/*",
    "*://cloudticity.zendesk.com/*",
    "*://teamwork.cloudticity.com/*"
  ],
  "web_accessible_resources": [
    "media/favicon_O2.png",
    "media/favicon_TW.png",
    "media/favicon_ZD.png"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}