Para Download

This is an extension that replaces the behavior of Ctrl+Tab (Cmd + Option + Tab on Mac).
Instead of directly changing tab it works some thing like Alt+Tab on windows. It views preview of the tab and you can change directly to the tab you want to or just go through all tabs to see what you got in them.

7- Download Manager Tweak
Official webpage: http://dmextension.mozdev.org/

An add-on that put some modifications on Firefox default download manager, it makes it more easy to use.

8- FEBE (Firefox Environment Backup Extension)
Official webpage: http://customsoftwareconsult.com

FEBE is a extension that helps you backup your Firefox extensions and it enables bundle them in one package that its easy to install, it makes a backup of your bookmarks, preferences and passwords if you want!

9- Find Toolbar Tweaks
Official webpage: http://homepage3.nifty.com

This is a Firefox extension to tweak features and display of the Find Toolbar.

10- Fire Encrypter
Official webpage: https://addons.mozilla.org/

FireEncrypter is an Firefox extension which gives you encryption/decryption and hashing functionalities right from your Firefox browser.

11- Flashgot
Official webpage: http://flashgot.net/

Flashgot is an extension that helps you integrate many download managers with Firefox, it helps you download single & massive downloads more easily.

12- Forecast
Official webpage: http://forecastfox.mozdev.org/

A great and handy extension that brings you international weather to your Firefox browser.

13- Gspace
Official webpage: http://www.getgspace.com/

This extension enables you to upload files and folders to your Gmail storage more easily.

14- GooglePreview
Official webpage: http://ackroyd.de/googlepreview/

This handy add-on shows a resized screenshot of the websites in Google/Yahoo! search results.

15- IE Tab
Official webpage: http://ietab.mozdev.org/

An extension that embeds Internet Explorer in Firefox tab, that enables you access and browse the sites that requires Internet Explorer.

16- MinimizeToTray
Official webpage: http://minimizetotray.mozdev.org/

A handy add-on that enables you to minimize Firefox to the tray by pressing Ctrl+Shift+M, or by right clicking on the minimize button in Firefox.

17- StumbleUpon
Official webpage: http://www.stumbleupon.com/

Channel surf the internet with the StumbleUpon toolbar to find great websites, videos, photos and more based on your interests. StumbleUpon learns what you like and makes better recommendations. With StumbleUpon you can also connect with friends and share your discoveries, meet people that have similar interests, and check out what other people are discovering.

18- PDF Download
Official webpage: http://www.pdfdownload.org/

PDF Download solves the problems everyone has about handling PDF files with Firefox. This extension, every time you click on a link, checks if the target is a pdf file and in this case let you choose what you want to do (open pdf file inside or outside Firefox, download it to the filesystem or view it as HTML). PDF Download is not a PDF plugin: you still need to have installed the Adobe or the FoxIt PDF plugin if you want to open a PDF inside Firefox.

19- Restart Firefox
Official webpage: https://addons.mozilla.org/

Restart Firefox with ease.

20- Screengrab!
Official webpage: http://www.screengrab.org/

a great and handy add-on that helps you save a webpage as an image (Take full screenshots of webpages).

21- ScribeFire
Official webpage: http://www.scribefire.com/

ScribeFire (previously Performancing for Firefox) is a full-featured blog editor that integrates with your browser and lets you easily post to your blog. You can drag and drop formatted text from pages you are browsing, take notes, and post to your blog.

22- Tab Mix Plus
Official webpage: http://tmp.garyr.net/

Tab Mix Plus enhances Firefoxs tab browsing capabilities. It includes such features as duplicating tabs, controlling tab focus, tab clicking options, undo closed tabs and windows, plus much more. It also includes a full-featured session manager with crash recovery that can save and restore combinations of opened tabs and windows.

23- Translator
Official webpage: https://addons.mozilla.org/

Its a handy tool that help you translate webpages easily with Firefox.

24- TrashMail.net
Official webpage: http://www.trashmail.net/

Create a new email address on trashmail.net. All mails to this address will be forwarded to your real email address for a number of times you can set up on the following form. When the limit is reached, the Trashmail.net email address will be automatically deleted. All following mails (like spam, newsletter, etc) will be rejected at Trashmail.net

25- Video DownloadHelper
Official webpage: http://www.downloadhelper.net/

The easy way to download Web videos from hundreds of YouTube-like sites. This works also for audio and picture galleries.

26- FoxyTunes
Official webpage: http://www.foxytunes.com/

Do you listen to Music while surfing the Web? FoxyTunes lets you control almost any media player and find lyrics, covers, videos, bios and much more with a click right from your browser.

27- Facebook Toolbar
Official Webpage: Facebook.com

Integrate Facebook with your browser.

28- Twitbin
Official webpage: http://www.twitbin.com/

TwitBin is an extension for firefox that brings the power of twitter right in your browser.

29- Digg This!
Official webpage: https://addons.mozilla.org/

The Digg This! extension speeds up the process of submitting stories to the news website digg.com

30- Organize Status Bar
Official webpage: http://yellow5.us/firefox/osb/

Organize Status Bar helps your organizing your status bar on Firefox by rearranging or hiding icons in your status bar.

That was the extensions I guess that they can make browsing easier for everybody, Hope you enjoy them all. And Ill be back with a detailed review with some guides for every extension mentioned here and some more good ones.

Firefoxian