The question is whether you should take the plunge, especially since reviews like the one done by Cnet seem to give it a glowing review, mentioning spectacular increase in loading times. Firefox 3 sports a shiny Web 2.0 style user interface.

BUT if you're a marketer and you use Firefox plugins in your daily work, you will want to hold off on the upgrade.

A number of my existing Firefox add-ons (ie plugins) were deemed to be incompatible with the new version of Firefox and I've lost the use of them (on my secondary machine).

Depending on the developer, it could be a few days or a few weeks before a compatible version is available.

If passing on the upgrade (for now) means that you will be able to do your work, it might be a better option for now.