Gmail is Google’s popular web based e-mail client. Gmail became popular because of its friendly user interface and the 2 gb space it provided in the beginning, which to date is extended to 7.3 gb. It already has lots of features but Firefox users can further customize Gmail by using different add-ons. You can divide these add-ons into two categories one are those which can change appearance of Gmail while second category add functionality to Gmail.

I decided to list the most useful and popular Firefox extensions for Gmail

1. Better Gmail 2

Add useful extra features to Gmail, like hierarchical labels, macros, file attachment icons, and more.

Better Gmail 2 compiles the best Greasemonkey user scripts for Gmail into a single package. All scripts copyright their original authors. Click on the script homepage in the About tab for help and more information. Only compatible with the new Gmail interface.

Better Gmail 2

Main Site | Download

2. GTDInbox

GTDInbox is an addon for Firefox that transforms Gmail into a powerhouse of productivity and manageability. GTDInbox gives you a better inbox.

GTDInbox

Main Site | Download

3. DragDropUpload

This extension lets fill an upload input of a form using the drag and drop service from the system. Just drop the file into the input box and then send it.

DragDropUpload

Main Site | Download

4. Gspace

This extension allows you to use your Gmail Space (7.3 GB and growing) for file storage. It acts as an online drive, so you can upload files from your hard drive and access them from every Internet capable system.

Gspace

Main Site | Download

5. Gmail Manager

The original Gmail notifier for multiple accounts. Allows you to manage multiple Gmail accounts and receive new mail notifications. Displays your account details including unread messages, saved drafts, spam messages, labels with new mail, space used, and new mail snippets.

Gmail Manager

Main Site | Download

6. Gmail Skins

Gmail Skins is an extension that tries to make your Gmail experiance a little better.

Gmail Skins

Main Site | Download

7. GPhotospace

GPhotospace is the fastest way to share photos online. This free photo album builder works elegantly with Firefox and Gmail. Use your existing Gmail account or create a new one for use with GPhotoSpace. Create any number of photo albums, store them and share them instantly.

GPhotospace

Main Site | Download

8. Gmail Contact Book

With this addon,you can now easily pick your contacts from the [Contact Book] by click the little book beside To,CC,BCC Boxs.

Gmail Contact Book

Main Site | Download

9. Remember The Milk

Remember The Milk for Gmail is a Firefox extension that allows you to manage your tasks in Gmail (complete, postpone, and edit tasks), add new tasks (and connect them with your emails, contacts, and Google Calendar events), automatically add tasks for starred messages or specific labels, and much more!

Remember The Milk

Main Site | Download

10. Easy Job Application

Easily send job applications using Gmail in websites like Craigslist.

Easy Job Application

Main Site | Download

11. WebMail Notifier

WebMail Notifier checks your webmail accounts and notifies the number of unread emails.

WebMail Notifier

Main Site | Download

12. Todoist

Todoist is a task manager that’s useful, fast and easy to use. We currently manage millions of todos for thousands of people.

Todoist

Main Site | Download

13. WiseStamp Email Signatures

WiseStamp a Firefox extension enables you to easily customize & add personalized email signatures on any webmail service (Gmail ,Yahoo Mail ,AOL mail, Hotmail, Google Apps…)

WiseStamp Email Signatures

Main Site | Download

14. WebMail Ad Blocker

More screen space for your messages! Yahoo Mail, Hotmail, and Gmail advertisements take up a lot of space even if they get blocked by other addons because they leave unused empty space.

WebMail Ad Blocker

Main Site | Download

15. Email This! Bookmarklet Extension

Email This! will send your recipient the link, title, & highlighted text of the page you are viewing using GMail.

Email This! Bookmarklet Extension

Main Site | Download

16. gTalk Sidebar

Can’t use gmail? Don’t have time to install Gtalk? Want a simple solution? Then try using gTalk from your sidebar!

Main Site | Download

17. FreeAccess Plus!

Bypass filter of del.icio.us, Flickr, Technorati.com, FriendSter.com, livejournal.com and MySpace.

FreeAccess Plus!

Main Site | Download

18. iFox Smooth

A minimal, compact, elegant theme for firefox.

iFox Smooth

Main Site | Download

If you want more firefox extensions for Gmail visit Mozilla.org

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