Warren Rabbit, unfortunately Google has not (yet) taken the step to provide similar add-in for Netscape.
But you can easily add a shortcut to the Navigator Toolbar.
1. Go to your favorite Google site
2. add the page to your Bookmarks
3. click on Bookmarks and Edit Bookmarks
4. in the new window highlight the Google bookmark
5. click on FILE and ADD SELECTION TO TOOLBAR
it is still not the same..but it may help
