Mozilla is asking users to test a new add-on for the Firefox browser that lets users monitor their deals on eBay's auction site in real time.

The beta test for the so-called Firefox eBay Companion is only open to users in the UK, Germany and France, but will eventually be opened up to the US and other countries, according to a Mozilla spokeswoman.

The eBay add-on is a sidebar that synchronizes with the eBay auction and e-commerce site, and displays alerts as items are sold or change status. It also has an integrated search tool. For security, it uses Firefox's antiphishing technology and eBay's Account Guard feature, which also detects spoof websites.

No more features will be added, although the add-on could be improved as feedback is received, the spokeswoman said. The final release will come by August, she said.