Examine source code of cursorthing

{
  "manifest_version": 2,
  "name": "cursorthing",
  "description": "make the web multiplayer",
  "version": "1.0",
  "icons": {
    "16": "/icon/icon_16.png",
    "32": "/icon/icon_32.png",
    "48": "/icon/icon_48.png",
    "96": "/icon/icon_96.png",
    "128": "/icon/icon_128.png"
  },
  "permissions": [
    "identity",
    "storage",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "cursorthing@nostabyte.com",
      "data_collection_permissions": {
        "required": [
          "websiteActivity",
          "authenticationInfo",
          "personallyIdentifyingInfo"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Default Popup Title",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "exclude_matches": [
        "http://localhost/*",
        "https://cursorthing.com/*",
        "https://www.cursorthing.com/*"
      ],
      "js": [
        "content-scripts/content.js"
      ],
      "world": "ISOLATED"
    },
    {
      "matches": [
        "http://localhost/*",
        "https://cursorthing.com/*",
        "https://www.cursorthing.com/*"
      ],
      "js": [
        "content-scripts/cursorthing.js"
      ],
      "world": "ISOLATED"
    }
  ]
}