Absolutely amazing.
Grepper saves me a ton of time by displaying little snippets of code on my search results instead of me having to manually search for them.

Doesn't work anymore on latest firefox

Great extension, only available on Chome since yet, I used and loved it for some months and only can approve his arrival on Firefox.
One of the must-have extensions for devs! It's so useful, very convenient, and very well-integrated. I sincerely recommend it to everybody beginning or working in the coding world!