Security experts are warning that adware and spyware pushers are trying to bundle their wares into the latest version of Firefox in order to trick users into downloading the software.

A new blog posting from network security firm eSoft explains that adware pushers are trying to capitalise on the success of Firefox 3.6 in order to extend their reach.

The fake Firefox download site uncovered by the firm has been designed to fool users hoping to upgrade, but contains the spelling errors which are often a tell-tale sign of a scam site, said the blog posting.

"Victims of this scam install the 'Hotbar' toolbar by Pinball Corp, formerly Zango," the post noted.

"Not only are users subject to the annoying toolbar, they're also barraged with pop-up ads and host to a new Hotbar weather application running in the system tray."

ESoft warned users only to download software directly from the publisher, where possible.