I just thought it would be interesting to list what I've been using on my browser. I'm very careful with not installing too much stuff because it can slow down the perf, but these are the tools that I can't live without:
On Internet Explorer:
- Alexa Toolbar: I just love to know the rank of sites that I visit.
- Compete Toolbar: Just like Alexa, but they give me a 1-click to my own sites information and they have this "Trust" level for sites (a bit of anti-phishing help)
- Fiddler: A neat HTTP tracer. This is for developers only.
- DevToolbar: An easy way to check and manipulate your page's HTML. (for web developers only)
On Firefox I use:
- Compete Toolbar: Same as IE's compete (I wish there was Alexa for FF)
- MeasureIt: An extension that let's me measure the distance between two pixels.
- Web Developer: This is a must have tool for any... well... web developer! Like the DevToolbar for IE, it let's you see and do a lot of interesting things with your HTML.
- Console 2: A great extension to filter JavaScript errors.
Any other tool/extension that I should be using?
I'm the Co-founder & CTO of 
