Is SingleFileZ safe?

Clean risk

SingleFileZ lets any web page request serialized page content from embedded cross-origin frames.

SingleFileZ injects a frame helper into every frame on every site and accepts frame-tree postMessage requests without checking the sender. A page that embeds another site can receive that frame's serialized document details, including URL, title, page content, images, stylesheets, and form input values.

gildasv1.4.45Firefox Add-ons
2Risk
Who publishes it

gildas - no other listings under this identity

What this publisher told the store about itself, and the other listings that told it the same thing.

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

Publishers can request a review.

What it can do

Permissions this extension asks for, as declared in version 1.4.45. 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>

  • Sign you in with your Google account

    identity

  • Add items to the right-click menu

    contextMenus

  • Start, monitor and manage your downloads

    downloads

  • Store data in your browser

    storage

  • See the address and title of every tab you have open

    tabs

menus
Updated 2 November 2026amo-2224810