I spend at least 25% of my day using my browser as one of my main working tools. When Google upgraded his account last week, Jim Sellers, a software programmer based in Ottawa, was eager to try Gmail 2.0's improved contacts manager, but his Firefox 2.0 browser kept crashing both on Windows 2000 and Mac OS X 10.4. However, these users say they have to switch manually every time they log on, because Gmail 2.0 automatically became their default version once they got upgraded to it. If these users switch to the 'old' Gmail version, the problems go away.