Rated 5 out of 5 stars

Just to (hopefully) clear up any confusion from the description, this is a bit like Google Suggest, but with Results. (Google Suggest is the feature where you get live search suggestions in a drop-down menu, live while you're typing).

Instead of just Suggestions, it gives Google RESULTS live while typing each letter, not just suggestions for what to do a search on.

It also works for Google Images, Videos (and Twitter) searches. It is VERY fast (thanks to Google's servers).

It should be noted that this 'plug-in' just adds a search engine to Firefox's Search Bar (for convenience). You can use/try this search engine at the heapr.com website without installing this.