As a system administrator, what Firefox plugin helps you do your job? [closed]

I know that there are several Firefox plugins that are invaluable for development. What plugins exist that are useful for system administration, monitoring, and the like? What plugins make your day-to-day job as a system or network administrator easier?

Solution 1:

ShowIP - allows me to see quickly the IP address of the server where a particular website is hosted. Assists in managing my many clients websites.

DNSCache - quickly disable/re-enable Firefox's builtin DNS Cache, particularly good if your also manipulating the site's DNS at the time

ScreenGrab - particularly good at capturing that error and sending to the developers.

Solution 2:

Foxyproxy - I cant stand getting attacked by others when they walk over with their stats and say "Hm this Serverfault.com you wasted 5 minutes of our time on it."

Solution 3:

Even for IT, I'd have to put FireBug at the top of the list, too much good information in there.and

Solution 4:

Tamper Data this is handy when you have to examine HTTP headers. This may be necessary if you have virtual hosts in a hosting environment. We also insert a field in the header to identify web machines in some of our web farms to identify problem hosts.