Is User Agent Switcher, URL sniffer Safe? — Extension Safety Profile

This extension requests the ability to read and change network requests for all websites you visit (using webRequest and declarativeNetRequest with access), and to store settings locally. These permissions are necessary to switch your browser's user agent string and to sniff URLs, which matches the extension’s described purpose. However, access to all URLs is a powerful scope that could theoretically allow the extension to monitor or alter any web traffic you generate, so it is wise to only grant it if you genuinely need these functions.

For general browser tools like this, safety considerations include the risk of over-permissive data access and the potential for a once-legitimate extension to become abandoned or compromised. A user agent switcher modifies how websites identify your browser, which can affect how pages load or whether device-specific restrictions apply. A careful user should verify that the extension’s behavior stays consistent with its stated features and check that it remains actively maintained.

Based on the fact sheet, the strongest safety dimension is Data & Privacy, where the developer’s stated practices align with data minimization. The weakest dimension is Maintenance & Ownership, which indicates a low score in that area and suggests you may want to confirm the extension has a clear maintenance history and is linked to a credible, publicly traceable publisher before relying on it long-term.