The best of its kind! Rated 5 out of 5 stars

I've used all sorts of addons for instant selection search, and this one beats them all.
It's simple enough not overthinking customization (i'm looking at you Hyperwords), well-designed enough not to make you go through a huge list of items in the context menu, smart enough to use your existing search engines without forcing you to have a redundant second list, it's fast, it's powerful - i abolutely love it.
One suggestion: add a "copy" icon, so when selecting text you're not intending to search, the pop-up doesn't become useless.
Thank you very much != Excelent job!
Wish you could keep developing it...
But hey, i've been through many FF updates and this addon has never stopped working.
Hope it never does!

This review is for a previous version of the add-on (0.3.110731.1-signed).