Simply the Best Rated 5 out of 5 stars
I have been searching, even yearning for something just like this! This is an amazing little add-on. I now use it multiple times a day.
I research for a living, and have to search within sites constantly. Once upon a time I used Google Toolbar for this specific in-site research, but all things Google are quickly becoming adware/malware, and I choose to no longer use said toolbar. This little extension finally fulfills what I was missing.