Keyword Difficulty Tool

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Keyword Difficulty Tool",
  "description": "This extension will analyze the keyword difficulty for a search term",
  "version": "1.2",
  "options_page": "options/options.html",
  "page_action": {
    "default_icon": "images/icon-16x16.png",
    "default_popup": "popup/popup.html"
  },
  "permissions": [
    "activeTab",
    "storage",
    "tabs",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "extension.js",
      "crypto-core.js",
      "crypto-hmac.js",
      "crypto-sha1.js",
      "crypto-base64.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.google.co.uk/*",
        "https://www.google.com/*"
      ],
      "js": [
        "contentscript.js"
      ]
    }
  ]
}