Examine source code of Fab Asset Filter

{
  "manifest_version": 2,
  "name": "Fab Asset Filter",
  "version": "1.1",
  "description": "Filter assets on fab.com by seller and ownership.",
  "permissions": [
    "storage",
    "activeTab",
    "*://*.fab.com/*"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon_48.png",
      "96": "icons/icon_96.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.fab.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "48": "icons/icon_48.png",
    "96": "icons/icon_96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{76ad06ff-330d-48ba-bd78-e94d2697814f}"
    }
  }
}