Examine source code of Rainbowz

{
  "manifest_version": 2,
  "name": "Rainbowz",
  "version": "2resigned1",
  "description": "Turns everything into rainbows",
  "icons": {
    "96": "icon.svg"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "rainbowz.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8bf79aee-02fc-4e65-8b1b-c7859995c74a}"
    }
  }
}