Firefox extensions can be very powerful tools, automating repetitive web tasks and making the web easier to use.
As many marketing programs are today managed through web apps, a little browser hackery can go a long way towards increasing the efficiency of your web marketing team.
O'Reilly's GreaseMonkey book is an solid introduction to FFox hacking.
And this week SoftwareDeveloper just put out a very nice web resource list for developing FFox extensions.
Think about the web tasks your team needs do over and over, working through internal or third-party web apps. Could some simple browser automation speed things up?