Examine source code of worm fren

{
  "manifest_version": 2,
  "name": "worm fren",
  "version": "1.0",
  "description": "a cool little guy that hangs out at the bottom of your page",
  "icons": {
    "48": "icon@48.png",
    "96": "icon@96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "worm.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "sprites/000.png",
    "sprites/001.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "worm-fren@fwfy.club"
    }
  }
}