Examine source code of DoubleClue PasswordSafe

{
  "name": "DoubleClue PasswordSafe Auto Login",
  "version": "3.0",
  "manifest_version": 2,
  "icons": {
    "16": "/assets/icons/exported/16x16.png",
    "48": "/assets/icons/exported/48x48.png"
  },
  "browser_action": {
    "default_icon": "/assets/icons/exported/38x38.png",
    "default_title": "DoubleClue PasswordSafe Auto Login"
  },
  "background": {
    "scripts": [
      "background-firefox.js"
    ]
  },
  "permissions": [
    "activeTab",
    "tabs",
    "<all_urls>",
    "storage",
    "clipboardWrite",
    "identity",
    "alarms",
    "notifications",
    "webNavigation"
  ],
  "description": "Log quickly and securely into your web applications.",
  "browser_specific_settings": {
    "gecko": {
      "id": "doubleclue@hws-gruppe.de"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "/src/injectAddonStatus.js"
      ],
      "run_at": "document_start"
    }
  ]
}