Examine source code of Useless color saver

{
  "manifest_version": 2,
  "name": "Useless color saver",
  "version": "1.2",
  "content_security_policy": "default-src *; style-src 'self' 'unsafe-inline'; script-src 'self' 'unsafe-inline' 'unsafe-eval'",
  "description": "is useless",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "script.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": {
      "32": "icon-32.png"
    },
    "default_title": "An useless color saver",
    "default_popup": "index.html"
  },
  "icons": {
    "48": "icon-48.png",
    "96": "icon-96.png"
  }
}