1. Top Firefox Tool-bars along with Google Toolbar Features
As everyone know Google tool-bar is no more compatible with Mozilla Firefox. Here are some
alternative add-ons which also have features like Google toolbar.
Xmarks Sync
Install Xmarks Sync From Firefox Add-on Store. It will help you to keep your
bookmarks, and open tabs backed up and synchronized across computers and
browsers...
Add to Search Bar
With This Add-on you can choose any other search engine in search bar. Which
would be helpful to you to get different search engine result also..
Spell Checker :-
Checks the (whole) web page (and not the text inside edit box) for spelling
mistakes and highlights it.
Add this
Best add-on to make sharing and bookmarking simple. Have all your favorite web
2.0 social networking, bookmarking, blogging, and e-mail services at your
fingertips. Share any page, anytime, with anyone.
Gmail S/MIME
It will help you to Send and receive signed and encrypted messages in Gmail.
These all tool-bars which we can use in the alternate of Google toolbar. Here I am sharing some more
add-ons which we can say popular Firefox toolbar.

2. Top Popular Add-Ons
Context Search :-
Expands the context menu's 'Search for' item into
a list of installed search engines, allowing you to
choose the engine you want to use for each
search....
Twitbin :-
Twitbin is a Firefox extension that allows you to
keep up with all of your Twitter conversations
right from your browser sidebar. Send messages,
receive messages, share links, and more...
Abduction :-
1) Capture an page or just a specific region.
2) Adds a right click option to take screen shots of an
entire web page or just part of a web page to save as
an image.
Feedly :-
A fast and stylish way to read and share the
content of your favorite sites. It brings a fresh
new experience to Google Reader.
All these Firefox toolbar will help you for easy browsing....