Examine source code of Keyword Trend

{
  "manifest_version": 2,
  "name": "Keyword Trend",
  "version": "1.1",
  "description": "A browser extension to find trending keywords.",
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "browser_action": {
    "default_icon": "icons/logo_64.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab",
    "https://api.example.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "contentScript.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{ced5c24a-4ee7-4653-abfb-892fa2f48335}"
    }
  }
}