Examine source code of Simple Color Picker New

{
  "manifest_version": 2,
  "name": "Simple Color Picker",
  "version": "1.0",
  "description": "A basic color picker extension for Firefox.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f5d160e4-92a3-4673-ae2d-b5a59c3001fd}"
    }
  }
}