This was expected. After yahoo came up with its own toolbar for firefox, one would've expected google to come up with its own, as well. It has, finally.

There were already couple of extensions for google on firefox. I had been using the 'googlebar lite' all these days. But what makes google's very own bar significant is that its way better than the existent ones. But hey, there's a catch! Google collects data via this toolbar!
The toolbar has all the functionalities that were there on the IE toolbar previously. There's an additional spellcheck option which is cool (Spellbound used to do that for me, anyway). PageRank is there (and yeah, its not dead, yet, for google). As in windows - IE counterpart of this plugin, the toolbar allows you to automatically fill forms (again, already done by firefox). But the coolest part is that it lets you autolink maps, books, and also vehicles from the toolbar itself ;)
A nice thing to appreciate is that it allows use of yahoo! maps, and other rival sites in all the three autolink searches. One can set the default autolinking service to either google maps, yahoo! maps or map quest. Same with books and vehicles - the contenders also get a chance :)
The trademark Google options like 'Blog This!' for blogger, News, Next - Previous buttons all are there :) Word translator is there, but not much of use for us, as no Indian languages are present on that.
But before using, beware! ;) Google says this in its privacy statement of the toolbar:
"if users are running the Google Toolbar with advanced features enabled, Google may collect information about webpages that they are viewing".