Examine source code of CloudBleed

{
  "name": "CloudBleed",
  "description": "Checks if you have visited any CloudBleed affected websites recently.",
  "version": "58.2resigned1",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "19": "images/icon19.png",
      "38": "images/icon38.png"
    }
  },
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "permissions": [
    "tabs",
    "history",
    "activeTab",
    "contextMenus",
    "cookies",
    "<all_urls>",
    "http://*/*",
    "https://*/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d61f024a-3eb1-4f08-aad8-4b4059bab6de}"
    }
  }
}