Is Web Developer Form Filler Safe? — Extension Safety Profile

The Web Developer Form Filler extension requests the activeTab permission, which allows it to interact with the currently focused tab only when the user invokes the extension. Combined with host access to <all_urls>, it can read and modify form data on any website the user visits, but only during active use. The storage permission lets it save form profiles or settings locally. For a developer tool designed to fill web forms, this permission scope is fairly typical and expected.

As with any developer tool that can inject or manipulate data on web pages, a careful user should be aware that such extensions can technically read or alter sensitive form inputs like login credentials or payment details if used on those pages. The general risk in this category is that a poorly maintained or compromised tool could be repurposed to exfiltrate data. Users should verify they are using the official, well-reviewed version and consider limiting its use to non-sensitive development or testing environments.

Based on the fact sheet, the strongest dimension is Data & Privacy, where the developer has declared clear data handling practices. The weakest dimension is Maintenance & Ownership, which suggests the extension’s update frequency, developer track record, or related signals may not inspire as much confidence. The overall community reputation and permissions score are moderate, and the privacy declarations are a positive, but the maintenance score is the main area of caution.