Is User-Agent Switcher Safe? — Extension Safety Profile

This extension requests broad permissions: it can store settings locally, inject scripts into any webpage, and modify network requests on all sites you visit. For a user-agent switcher, the ability to alter HTTP headers via declarativeNetRequest is expected, but the combination of scripting and full host access means it can technically read and change every page’s content and all network traffic. That scope is higher than strictly necessary for simply changing the user-agent string, though it may support advanced features like per-site rules.

General safety considerations for browser tools that modify requests include the risk that a poorly maintained or malicious version could intercept sensitive data or alter page behavior. A careful user should verify that the extension comes from a trusted source, review its permissions, and consider whether a simpler alternative with narrower access would suffice. Since user-agent switchers are often used for privacy testing, be aware that they can also be used to track you if the extension itself phones home.

In this case, the strongest dimension is Data & Privacy, where the developer has declared that data is not sold or misused, earning a perfect score in that category. The weakest dimension is Permissions & Access, reflecting the extensive host and scripting privileges that lower the safety margin. While the extension is currently maintained and has a decent community reputation, the permission model demands caution.