Yoslion Download by Palacios Software Group LLC

Yoslion Download is the Firefox companion for the Yoslion Download desktop application. The extension downloads nothing itself — it hands the download to the application, which does the work.

The desktop application is required. Without Yoslion Download installed and able to run on the same computer, the extension has nothing to hand a download to, and it says so rather than failing quietly.

It takes over the downloads you start, and this begins switched on. When you start a download in Firefox, the extension passes it to the desktop application instead, so the file is fetched once rather than twice. On a new installation this is on; one click in the toolbar popup turns it off, and your choice is remembered.

Upgrading from 1.0.0 leaves it off. This version decides a download before the file starts arriving, which is not the mechanism the earlier version asked you about, so it does not assume the answer: after the upgrade the takeover is off, and one click in the toolbar popup turns it on whenever you want it. Permission you had already given for downloads that need a login is carried across separately and keeps working.

Right-click a link → Download with Yoslion. The other way to use it, and it works whether the takeover above is on or off. The menu item appears on links only.

Downloads that need you to be signed in. Some files are only served while you are logged in. If you switch Use my browser session on and grant access to the site, the add-on passes that site's session to the application for the download you started, so it is fetched as you rather than as a stranger. It is off until you turn it on, it applies to the download you started and to nothing else, and it is never written to disk. Sites that need something other than a session cookie — a sign-in form posted at the moment of download, for instance — are not covered by this, and the add-on says so rather than saving the login page as your file.

A container keeps its own session. If you use Firefox Containers, a download started in a container is handed over with that container's session and not with the default one.

Nothing is sent to a server. The web address reaches the local application over Firefox's native messaging channel and stops there. The extension makes no network requests of its own, and contains no analytics and no advertising.

Firefox 140 or later, on desktop. The application it needs is published for Windows and Linux; macOS is not claimed, because the only macOS build on offer is an older one that Gatekeeper refuses to run from a download.