Examine source code of Function Optimizer

{
  "manifest_version": 2,
  "name": "Function Optimizer",
  "version": "1.0",
  "description": "Find the value of x that maximizes or minimizes a given function f(x).",
  "icons": {
    "48": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "popup.js"
      ],
      "css": [
        "popup.css"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{37ef9294-c46f-46e8-a6c1-d4eeae33d007}"
    }
  }
}