Examine source code of Browser JSGuard

{
  "manifest_version": 2,
  "name": "BrowserJSGuard",
  "version": "4.0.2",
  "description": "An Addon for Detecting Malicious and Suspicious Webpages.",
  "icons": {
    "128": "icon_128.png"
  },
  "background": {
    "scripts": [
      "background_script.js"
    ]
  },
  "content_scripts": [
    {
      "all_frames": false,
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "jquery.js",
        "user_alert.js",
        "content_script.js",
        "purify.min.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_action": {
    "default_icon": "cdac18.png",
    "default_title": "Webpage Behavior Report",
    "default_popup": "popup/popup.html"
  },
  "author": "C-DAC, Hyderabad",
  "applications": {
    "gecko": {
      "id": "jid1-iazLAsIkHmx2Vw@jetpack"
    }
  },
  "permissions": [
    "tabs",
    "activeTab",
    "<all_urls>",
    "webRequest",
    "webRequestBlocking",
    "storage",
    "webNavigation"
  ]
}