Examine source code of Web Time Machine

{
  "manifest_version": 2,
  "name": "Web Time Machine",
  "version": "3.2.0",
  "description": "Passively record, sync, and full-text search the readable text of every page you visit.",
  "permissions": [
    "storage",
    "alarms",
    "http://*/*",
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Web Time Machine"
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "web-time-machine@webtm.io",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "browsingActivity",
          "websiteContent"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "120.0"
    }
  }
}