Examine source code of HISTORY Code

{
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "short_name": "__MSG_extShortName__",
  "version": "1.0.1",
  "default_locale": "en",
  "description": "__MSG_extDesc__",
  "applications": {
    "gecko": {
      "id": "code@history",
      "strict_min_version": "57.0"
    }
  },
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "browser_action": {
    "browser_style": false,
    "default_icon": {
      "19": "images/icon19.png",
      "38": "images/icon38.png"
    },
    "default_title": "__MSG_extShortName__",
    "default_popup": "view/popup.html"
  },
  "background": {
    "scripts": [
      "dist/background.js"
    ]
  },
  "permissions": [
    "activeTab",
    "<all_urls>",
    "clipboardWrite",
    "storage",
    "identity"
  ],
  "optional_permissions": [
    "clipboardWrite",
    "https://www.google.com/",
    "https://*.dropboxapi.com/*",
    "https://www.googleapis.com/*",
    "https://accounts.google.com/o/oauth2/revoke"
  ],
  "web_accessible_resources": [
    "view/qr.html",
    "images/scan.gif"
  ],
  "content_security_policy": "script-src 'self'; font-src 'self'; img-src 'self' data:; style-src 'self' 'unsafe-inline'; connect-src https://www.google.com/ https://*.dropboxapi.com https://www.googleapis.com/ https://accounts.google.com/o/oauth2/revoke ; default-src 'none'"
}