I have used this extension for about a year now. I probably use it every 5-10 min of time spent surfing. It's not working right now in FF 3.5b4, but I hope it will continue to be supported. Otherwise I may have to stick to FF 3.1. Yes, I love this extension THAT much!
It didn't seem like much of an extension when I installed it, but I am surprised by how much I use it to search google because the results are so much more accurate than a plain text query. I would like to see more options to search for different types of files that google has indexed. Thanks for the nice extension.
Super cool and easy advanced search! I suggest giving names to those Operators so that users can learn quicker and select the right command easier, or at least giving a chance for customization on this.