Examine source code of FastVault

{
  "manifest_version": 3,
  "name": "FastVault",
  "version": "1.1.2",
  "description": "Auto-fill passwords from your self-hosted FastVault password manager",
  "browser_specific_settings": {
    "gecko": {
      "id": "fastvault@fastrack.local",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "permissions": [
    "activeTab",
    "storage",
    "scripting"
  ],
  "host_permissions": [
    "https://fastvault.fastrackmedicalbilling.com/*",
    "http://localhost:9001/*"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "FastVault",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "exclude_matches": [
        "https://fastvault.fastrackmedicalbilling.com/*",
        "http://localhost:9001/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://fastvault.fastrackmedicalbilling.com/*",
        "http://localhost:9001/*"
      ],
      "js": [
        "detector.js"
      ],
      "run_at": "document_start"
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}