Here is a list Best and Popular Firefox addon/plugins for power users. These plugins makes your web browsing safer, smarter and easier.
1. FireDownload :
The FireDownload extension for Firefox and Wyzo lets you manage and accelerate your web downloads up to 10x faster! With FireDownload, download acceleration is seamlessly displayed within the downloads window. Try the ultimate download accelerator!
Save time by speeding up repetitive tasks. Get faster, parallelized downloads, see definitions, auto-load the next page, improve searching, and more. FastestFox will dramatically enhance your productivity!
3. Adblock Plus :
Annoyed by adverts? Troubled by tracking? Bothered by banners? Install Adblock Plus now to regain control of the internet and change the way that you view the web.
Download YouTube videos in FLV, 3GP and MP4 (both High Definition and iPod compatible High-Quality).
The simplest YouTube Video Downloader for all YouTube Flash sites, period.
Would you like to know which websites you can trust? The WOT add-on is a safe surfing tool for your browser. Traffic-light rating symbols show which websites you can trust when you search, shop and surf on the Web.
6. FlashGot :
Download all the links, movies and audio clips of a page at the maximum speed with a single click, using the most popular, lightweight and reliable external download managers.
Download Flash and Video is a great download helper tool that let you download Flash games and Flash videos (YouTube, Facebook, Dailymotion, Google Videos and more) with a single click.
The downloader is very easy to use.
8. BetterPrivacy :
Ever wondered why you are still tracked though you tried everything to prevent it?
BetterPrivacy is a safeguard which protects from usually not deletable LSO’s on Google, YouTube, Ebay.
9. PDF Download :
Use PDF Download to do whatever you like with PDF files on the Web. Regain control and eliminate browser problems, view PDFs directly in Firefox as HTML, and use the all-new Web-to-PDF toolbar to save and share Web pages as high-quality PDF files.
10. SkipScreen :
Skips unnecessary pages on sites like Rapidshare, Megaupload, zShare, Mediafire, and more. Try it out, or watch a demo at skipscreen.com
SkipScreen will be tenaciously maintained and improving all the time. Why click through ad-laden pages and wait for countdowns when your computer can do it for you?
11. Image Zoom :
Adds zoom and rotation functionality for images.
FacePAD, better known as the Facebook Photo Album Downloader will allow you to download your friends’ entire Facebook albums with a click of a button.
13. Alexa Sparky :
Alexa Internet’s official add-on for Firefox! Get Alexa data in your status bar.
Save an image of a web page (including Flash content) to a file. Web page screenshots may be captured interactively or from the command line. Options allow you to control the output format (PNG or JPEG), image file name, scaling, and much more.
15. Read It Later :
Save pages to read later with just one click. When you have time, access your reading list from any computer or phone, even without an internet connection!
All your social networks and instant messaging in one easy to use app – it’s the #1 downloaded social networking add-on for Firefox. Get all your updates, update your status and share across Facebook, Twitter, LinkedIn, YouTube & more – all at once!
17. ImTranslator :
ImTranslator includes Online Translator in 1640 language combinations. Multilingual Dictionary for English, French, German, Italian, Portuguese, Russian, Spanish; Virtual Keyboard for more than 40 languages; Russian Decoder; Interface localization in 11 languages;
Web page and text translator, dictionary, grammar checker, auto translation, text-to-speech, and language learning services. Supports over 3,000 unique language pairs and 31 online translators, including Google Translate, Wikipedia, and Babylon.
19. Download Statusbar :
View and manage downloads from a tidy statusbar – without the download window getting in the way of your web browsing.
20. NoScript :
The best security you can get in a web browser! Allow active content to run only from sites you trust, and protect yourself against XSS and Clickjacking attacks.
21. Personas Plus :
Free, easy-to-install “skins” for Firefox. Choose from over 60,000 cool designs, including art from Harry Potter and Bob Marley. Join over 8 million people from around the world who are asking themselves: “What Will My Browser Wear Today?”
22. Better Gmail 2 :
Add useful extra features to Gmail, like hierarchical labels, an unread message icon on your browser tab, file attachment icons, and more.
23. FoxTab :
3D in your browser! FoxTab brings innovative 3D functionality to your Firefox. New! Top Sites for FoxTab (aka Speed Dial).
24. FireGestures :
A customizable mouse gestures extension which enables you to execute various commands and user scripts with five types of gestures.
25. Pixlr Grabber :
Making screen grabs and pulling down images from the web just got a bit more easy. With the Pixlr grabber add-on you can choose to Edit, Share, Save or Copy your final grabs.
If any plugins are missed here, that shouldn’t be missed then do comment on those.