This is a critical extension to anyone moderating Reddit, it really should be a part of Reddit itself.

The people behind toolbox are pretty cool lads. Spending their free time making the life of moderators easier.

Couldn't live without this

I wouldn't say the developers are responsive, but after several weeks I solved my issue by myself and Toolbox has been working fine again.

This tool allows you to keep track of users, and communicate more easily with users and other mods. Reddit really should be pinging these guys to bake their toolbox functionality directly into reddit, but this is the second-best thing, and I applaud these guys for making a great extension.

If you use it once you'll never want to moderate on reddit without it. Its just that useful. And it has many customizations to get things just the way you want them.