With the passing of the Toolbar for Firefox, the only supported browser is Microsoft's Internet Explorer (IE). Google declined to comment on whether the IE Toolbar will also face extinction, or if so, when.

For its part, Mozilla did not immediately reply to questions about the Toolbar, including when Google told it of the end-of-life decision. The company did, however, stress that the add-on's termination would not affect the deal that provides Mozilla the .

"The Google Toolbar for Firefox is not in any way connected to the search arrangement between Mozilla and Google which continues to be a strong and mutually beneficial partnership," a Mozilla spokeswoman said in an email.

Gregg Keizer covers Microsoft, security issues, Apple, Web browsers and general technology breaking news for Computerworld. Follow Gregg on Twitter at , on or subscribe to . His e-mail address is .

in Computerworld's Browsers Topic Center.