Examine source code of Browser Guard

{
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "version": "0.0.3",
  "manifest_version": 2,
  "content_security_policy": "default-src 'self';",
  "icons": {
    "16": "art/browser-guard-16.png",
    "24": "art/browser-guard-24.png",
    "32": "art/browser-guard-32.png",
    "48": "art/browser-guard-48.png",
    "64": "art/browser-guard-64.png",
    "128": "art/browser-guard-128.png",
    "256": "art/browser-guard-256.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "art/browser-guard-16.png",
      "24": "art/browser-guard-24.png",
      "32": "art/browser-guard-32.png",
      "48": "art/browser-guard-48.png",
      "64": "art/browser-guard-64.png"
    },
    "default_popup": "html/popup.html"
  },
  "permissions": [
    "tabs",
    "webRequest",
    "webRequestBlocking",
    "storage",
    "<all_urls>"
  ],
  "background": {
    "page": "html/background.html",
    "persistent": true
  },
  "web_accessible_resources": [
    "html/blocked.html"
  ]
}