FireFox is an open source browser so developers are free to create add-ons & extensions.

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FireFox Add-ons & Extensions

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Moxilla's FireFox team defines an extension as:

"Extensions are small add-ons that add new functionality to Firefox, from a simple toolbar button to a completely new feature. They allow you to customize Firefox to fit your own needs and preferences, while letting us keep Firefox itself light and lean."

Other types of add-ons for FireFox include custom themes or skins, plugins for things like Flash and Java and search engines of all types to add to the search window at the top of FireFox.

Our favorite FireFox add-on

IE Tab by PCMan (Hong Jen Yee), yuoo2k

IE Tab - an extension from Taiwan, features: Embedding Internet Explorer in tabs of Mozilla/Firefox.
This is a great tool for web developers, since you can easily see how your webpage displayed in IE with just one click and then switch back to Firefox.
If you need some instructions.
Please visit our official website on

Most popular extensions

Cisco WebEx Extension 1.0.13

Cisco WebEx web and video conferencing is an easy, cost-effective way to exchange ideas and information online with anyone, anywhere on any mobile device or video system. Accelerate decision-making, keep projects on track, and collaborate in real time with integrated audio, video, and content sharing, all in one meeting. Enhance engagement with a lifelike video experience, which rapidly builds relationships and trust, just like you would in person. Make connecting simple for smoother meetings so users can invite others to easily join with their own video system. From the proven industry leader in web and video conferencing, rely on secure, scalable WebEx meetings from the global Cisco Collaboration Cloud.

Greasemonkey 4.1

Allows you to customize the way a web page displays or behaves, by using small bits of JavaScript. You can write your own scripts, too. Check out to get started. Many scripts already exist, probably ones to enhance your favorite sites. Find them at . Having trouble? Please don't post comments here, nobody will see them. If you need help, please read:

EPUBReader 2.0.5

IMPORTANT Due to limitations in the new WebExtensions programming interface, I had to make the following changes:

  • Local ebooks can now only be opened via the EPUBReader toolbar button. Opening from file explorer via doubleclick or via the Firefox menu "File/File open" no longer works.
  • The private library no longer exists. If you want to export your ebooks which were stored in the library, please install the Library Exporter Add-on.
If you click on a link to an ePub file, you are normally prompted with the Firefox save dialog. With EPUBReader installed, you don't see the dialog. EPUBReader downloads the file, makes some processing and displays the ePub file ready to read! If you have got already downloaded ePub-files, you can read them by clicking on the EPUBReader toolbar button. If you experience any problems, please let me know, I'm very happy to help you. Please contact me via the link of my support-website.

Garmin Communicator

The Garmin Communicator is an internet browser plugin that allows you to easily transfer data between websites and Garmin GPS devices.

Session Manager

Unfortunately do to limitations in the the provided APIs in Firefox 57, Session Manager cannot be implemented as a WebExtension add-on and will not work in Firefox 57 or higher. My only recommendation is to either not update to Firefox 57, use the Firefox ESR build or use a forked version of Firefox that does not remove support for add-ons such as CyberFox or Waterfox. Session Manager saves and restores the state of all or some windows - either when you want it or automatically at startup, after crashes or periodically. It can also automatically save the state of open windows individually. The add-on is restartless and can be enabled and disabled on the fly. This extension replaces SessionSaver and Tab Mix Plus' session manager. Session Manager is compatible with Tab Mix Plus. It can import sessions from both SessionSaver and Tab Mix Plus. See for the complete users and options guide. Feedback can be sent to support email address listed to the top right or at The later is preferred. If you are having problems, please open the Browser Console (Firefox/Tools -> Web Development -> Browser Console) and disable and re-enable Session Manager and look for errors in the error console. If there aren't any enable logging in the options menu and disabling and re-enable Session Manager again and send the logs to the email address listed on the right. NOTE: I CANNOT OFFER SUPPORT THROUGH THE REVIEW PAGES, PLEASE USE THE SUPPORT LINKS TO THE RIGHT. IF REPORTING A PROBLEM, PLEASE READ THE ABOVE PARAGRAPH FOR INSTRUCTIONS.

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