FireFox is undoubtedly one of the most usable browser in world and fist browsers to allow third party plugin and extension. There are numerous Firefox add-ons, extension available which are well compatible and offers great support and help to achieve the appropriate things such as Firebug for developers, Xpath finder for selenium testers and speed optimization plugins for SEO stuff.
Top 20 Firefox Add-ons
After a long search i came up with a list of 20 best and must have FireFox Add-ons & plugins.
1. 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.
Browse faster—Preview links and images without leaving your current page or tab. Just mouseover any link and a preview window appears to display the content.
Downloadhelper Firefox add-ons helps in easing the way you download and convert Web videos from hundreds of YouTube-like sites. This works also for audio and picture galleries. The tiny Firefox add-on DownloadHelper helps with downloading items from the Internet, but install suffers from a minor glitch.
When you find something on the web that you want to view later, put it in Pocket. Pocket Firefox Add-ons automatically syncs to your phone, tablet or computer so you can view it at any time, even without an internet connection.
6. All-in-One Sidebar
AIOS lets you open various windows as sidebar panels, and quickly switch between them. So it put an end to the window chaos! In addition to bookmarks and history it opens dialogues such as downloads, add-ons and more in the sidebar.
AutoPager automatically loads next pages when you reach the end of a page. It works on a ton of sites,Google,Yahoo.. It works well with most other add-ons adblock plus, WOT and most of the greasemonkey scripts.
Yoono is free software that allows you to connect and share with all your social networks and instant messaging services in one place. Connect to all your social networks and never miss another status update from friends or family.
DownThemAll is all you can desire from a download manager: it features an advanced accelerator that increases speed up to 4x and it allows you to pause and resume downloads at any time.
The best security you can get in a web browser! NoScritp Allow active content to run only from sites you trust, and protect yourself against XSS and Clickjacking attacks.
12. Session Manager
Session Manager saves and restores the state of all or some windows – either when you want it or automatically at startup and after crashes. It can also automatically save the state of open windows individually.
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!
14. Download Statusbar
Despite its compact size, Download Statusbar packs in more useful features than the standard download window. The fully customizable interface auto-hides when not in use, allowing full control without interruption.
15. Firefox Showcase
Showcase provides a new way to manage your Firefox tabs and windows by showing them as thumbnails in a single window, tab or sidebar.
16. Colorful Tabs
The most beautiful yet the simplest add-on that makes a strong colorful appeal. Colors every tab in a different color and makes them easy to distinguish while beautifying the overall appearance of the interface.
The international weather forecasts from AccuWeather displays a summary of weather forecast for a given location in the status bar or menu bar. Forecastfox is highly customizable Add-ons for Firefox – Mozilla Add-ons.
FireFTP is a free, secure, cross-platform FTP/SFTP client for Mozilla Firefox which provides easy and intuitive access to FTP/SFTP servers. FireFTP is a simple but powerful add-on that gives you an FTP client within Firefox.
MeasureIt is a tool for web designers and developers to help easily measure and size up elements right on their website. The on-screen ruler of MeasureIt quickly perform on-screen measurements.
The Foxmarks Bookmark Synchronizer Firefox Extension offers bookmark synchronization, search enhancement and web discovery based on sites bookmarked by user. It allows the same bookmarks on all computers that you use, at work, at home, on different operating systems.
Here is another list of 10 Firefox add-ons specifically designed for web developers.