Examine source code of Local Password Manager

{
  "manifest_version": 2,
  "name": "Secure Vault Autofill",
  "version": "1.0.1",
  "description": "Fills usernames and passwords from your local Secure Vault app.",
  "browser_specific_settings": {
    "gecko": {
      "id": "secure-vault@local",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "http://127.0.0.1/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "autofill.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_title": "Secure Vault Autofill",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  }
}