Microsoft's Internet Explorer still prevails in the top spot. The figures, for the month of November, were released this week by Net Applications.

That 20% plus share may hold through December's figures when they come out next month. But, don't be surprised if they slip again in January.

Here's why:

Firefox is primarily popular with residential customers. November featured a lot of downtime at home due to the holidays.

Then again...

Given Firefox's popularity with residential clients, the sour economy may be good for their business. I'm imagining all those recently laid off workers home surfing the web for job postings, contract work and face time on Facebook.