Google's freshly out of beta Firefox toolbar incorporates Google Suggest and a resizable search box into your web browser.
The Google Firefox toolbar may seem redundant since there's already a search box built in. However, Google's toolbar search box suggests terms and the number of results they'll return dynamically as you type. The input box is resizable, and all of the icons can be arranged any which way on your browser chrome areas to save real estate. The toolbar also displays PageRank and supports search term highlighting. The Google Toolbar for Firefox is a free download, and works everywhere Firefox does (PC, Mac and *nix.)
New, improved, and out of beta [Google Blog]