Is Simple Form Fill safe?

Medium risk

Simple Form Fill can show saved form-fill snippets inside every visited page when autocomplete is enabled.

When optional autocomplete is enabled, Simple Form Fill injects autocomplete scripts into every completed tab and uses saved snippets from local extension storage as input suggestions. Those suggestions are added as ordinary page DOM elements for non-password fields, so the visited site can potentially read matching saved snippets shown on the page.

Part of this rating comes from analysis signals we haven't published as detailed findings yet.

Sebastian Blaskv3.1.0Firefox Add-ons
42Risk

AI-generated. Findings may contain errors. Those marked Verified have been manually reviewed.

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What it can do

Permissions this extension asks for, as declared in version 3.1.0. Asking for a permission is not a finding on its own - it is what the extension can do if it chooses to.

  • Read and change your data on every site you visit

    <all_urls>

  • Add items to the right-click menu

    contextMenus

  • Run its own code inside the pages you visit

    scripting

  • Store data in your browser

    storage

Updated 30 September 2026amo-642690