It’s 2012, only two months left to welcome the new year 2013. Now it’s time for conclusions and left overs. This post is for Firefox add-ons which are popular and useful. I have some of the posts about add-ons. But gap between today’s date and those posts is getting deeper, and this gap has produced many new Firefox add-ons. However, this post is not only about year 2012 add-ons.

(01) Tab Mix Plus
If you want to do some experiments with your tabs, you can try this add-on. Improve your browsing capabilities. Easily duplicate tabs, control focus on tabs, undo close and windows.

(02) ReminderFox
This add-on helps you to remind things and complete to do lists. You can create lists, set alarms and alerts.

(03) Download_Manager Tweak
DMT let you made tweak download manager, so download manager can be open as a tab in browser and some management options as save, delete and open.

(04) Zotero
You can collect and manage your research sources. It has many options as collaborate, cite and share.

(05) Wisestamp-Email Signature
Email clients like Gmail, Yahoo and Outlook don’t offer attractive email signature options; here Wisestamp comes. You can easily tweak your email signature by adding your blog address or Facebook, twitter, Pinterest, LinkedIn etc.

(06) AutoProxy
If you are a privacy concerned person blocked by a website, this plugin keeps you on proxy automatically.

(07) ImTranslator – Online-Translator-Dictionary, TTS
it’s an online translator of many languages, it also has a spell checker and virtual keyboard.

(08) Saved-Password-Editor
This add-can enables you to add and edit default password manager in Firefox.

(09) Similar-Sites
This add-on helps you to search similar sites.

(10) Pocket (formerly Read It Later)
Read it latter add-on is now as Pocket. You can save interesting stuff while surfing the web to read them later.

(11) WOT
This add-on helps you know about trusted websites. So if a website is not trusted you leave that site at once.

(12) Do Not Track Plus
When you visit a website, you are being tracked by hidden cookies, so if you do not want to tracked you can install this plugin.

(12) Link Alert
This add-on will tell whether a link is a link for website, secure, email link, pdf file, text link or image file.

(13) Simple-Mail
Simple mail is a mail client for Firefox. It allows you to send receive and notify for multiple email accounts inside Firefox.

(14) ScribeFire Classic
If you are a blogger then this handy add-on is for you, you can blog without any hassle without leaving your browser, it is a fun, search real-time material in twitter and blog it with ScribeFire.

(15) LastPass Password-Manager
If you believe in ease of use then it is recommended add-on, you can easily generate password, fill forms, its like RoboForm toolbar but it do everything online, you can store your passwords and use it to login any time.

(16) Lazarus: Form Recovery
It saves anything you type in a form, so if browser crashes, server gets down or whatever happens you can get back what you have typed with right-click.

(17) Download-Statusbar
You can view and manage your download via status bar.

(18) Mozilla-Archive Format
Open web pages saved in other browsers, You can save many tabs, video and audio in a single zip file.

(19) NoScript
Most of the hacker hack a browser by using malicious scripts and this add-on disables scripts.

(20) QuickWiki
QuickWiki let you lookup in Wikipedia and Wiktionary without opening any a new tab.

(21) Personas Plus
With Personas Plus you can install Firefox skins.

(22) Memonic-Web Clipper
You can save relevant part of any webpage and share and discuss them with your friends.

(23) Context-Search
It adds install search engines in Context menu’s ‘Search for’, by default in context menu there is only one option.

(25) All-in-One Sidebar
You can open various windows as sidebar panels and switch between them.

(26) FireGestures
Set customizable mouse gestures to execute various commands and user scripts.

(27) FastestFox
If you like browsing the web in speed, Fastestfox can help you, it can auto load next page and search definitions.

(28) StumbleUpon
Explore interesting photos, video and web pages.

(29) FoxyProxy
Advanced proxy management tool, it replaces default proxy tool of Firefox.

(30) Flashblock
Now-a-days you will find Flash animations on websites and that are really cunning. With this add-on you can get rid of them.

(31) ScrapBook
Save web pages and organize them  in collections.

(32) Ghostery
See who is tracking you and protect yourself by blocking them out.

(33) Google-Shortcuts
If you are a Google maniac, get all the Google shortcuts in a single drop down menu.

(34) Stylish
Style the web with this add-on, easily add themes and skins in Google, Facebook and in many other skins.

(35) AnonymoX
Browse the web anonymously without revealing your identity.

(36) Forecastfox
Get international weather forecasts.

(37) AutoPager
Next page will be loaded automatically after reaching to the end of the current page. It works on most of the popular sites.

(38) ProCon Latte
Block the web pages containing pornographic materials or any kind of page using keyword filter.

(39) Session Manager
Save the current session of the open windows and tabs. It is very useful after Firefox crashes.

(40) Amazon Wish list
It’s official Amazon add-ons, you can add any item from any website in Amazon wish list account.

(41) Evernote Web Clipper
Save notes in Evernote account.

(42) RightToClick
Stop annoying java script as right-click disabled. If right-click is not enabled on a website or text selection is not enabled this add-on is useful.

(43) EPUBReader
To read ePub files you don’t need to download and install any software in computer. read epub files in browser.

(44) CoolPreviews
See preview of a link without opening it in a new tab. You just need mouse hover over a link.

(45) ImgLikeOpera
If you have slow internet connection, image loading can eat up your bandwidth, so this add-on will load only image that you want to see.

(46) Autofill Forms
Fill out web forms with just one click.

(47) Readability
remove clutter from web pages to ready them without any difficulty.

(48) AutoCopy
Copy any text on clipboard by selecting it.

(49) Click&Clean
Clean search history, cookies, Flash LSO, download history with one click.

(50) Unhide-Passwords
If you are sure no one is on your shoulder, you can sue unhide password extension to show password in password filed instead of asterisk.