Onfolio is free now04 Apr 2006
Microsoft acquired Onfolio and now it comes free with Microsoft Windows Live Toolbar. I got an email from Onfolio that I can request refund since I bought Onfolio last year. Cool!
But I think, FireFox extension is not installed anymore. I guess, you can still use old extension as long as you don't uninstall it while removing old Onfolio version.