Browser extension

Hand your browser’s downloads to the engine

The extension is the part that lives in the browser: it takes over a download the moment you click it, carries your cookies and referrer across so files behind a login still work, and spots videos on a page so they can be fetched as one file. The downloading itself is done by the app on your machine — over many connections, resumable, and unaffected by closing the tab.

Where it is today

It is not in the Chrome Web Store or on addons.mozilla.org yet — those listings are being prepared. Until they are live, installing it means loading it yourself, and the steps below are the real ones, not a placeholder.

Install the app first. The extension does nothing on its own: everything it catches is handed to the engine running locally, and with no app installed it deliberately steps aside and lets the browser download the file normally.

Get the app

Chrome, Edge, Brave, Vivaldi

Chrome has refused to install extension packages from outside its store since 2015 — a downloaded .crx is rejected with CRX_REQUIRED_PROOF_MISSING no matter where it came from. That is a browser rule, not something a download manager can work around, so the package below is a plain zip and it is loaded unpacked:

  1. Download the zip and unpack it somewhere you will keep — the folder has to stay put, the browser reads it from there on every start.
  2. Open chrome://extensions (Edge: edge://extensions).
  3. Turn on Developer mode, top right.
  4. Click Load unpacked and pick the unpacked folder.

Chrome will show a “disable developer mode extensions” prompt on some startups. That is its standard warning for anything not installed from the store; it goes away once the listing is live and you switch over to it.

Download for Chrome / Edge .zip, 44 KB

Firefox

Release Firefox only installs extensions signed by Mozilla, so until the listing is live this is a temporary install — it works immediately and is removed when you quit Firefox:

  1. Open about:debugging#/runtime/this-firefox.
  2. Click Load Temporary Add-on…
  3. Pick the manifest.json inside the unpacked folder.

Download for Firefox .zip, 47 KB

Safari

Not shipping yet. A Safari extension has to be delivered inside the macOS app rather than as a download, so it arrives with an app release rather than from this page.

What it is allowed to see

The permission list is broad, and it should be explained rather than waved through. It talks to exactly one address — the engine on your own computer at 127.0.0.1 — and nothing it reads is sent to us or to anyone else. Every permission and its specific reason is on the privacy page.

Last updated 2026-07-28.