Examine source code of Color Picker

{
  "manifest_version": 2,
  "name": "Color Picker",
  "version": "1.0",
  "description": "Pick colors from any webpage and copy the color code.",
  "permissions": [
    "activeTab",
    "storage",
    "contextMenus",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Pick a Color"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9f4cef38-36bc-4f47-bf5c-fa35668a635d}"
    }
  }
}