To disable a Firefox Add-On follow the instructions below.
1. Click On Tools.
2. Click On Add-Ons.
3. Select Add-On you wish to disable.
4. Click on the Disable button.

To remove an unwanted add-on follow the steps below:
1.Click On Tools
2.Click On Add-Ons
3.Click On The Extensions Button
4.Click on Add-On you wish to uninstall
5.Click On Uninstall

To install a Firefox Add-On follow the below steps:

1. Go to the website containing the Firefox Add-On, the Mozilla Add-On website contains many add-ons available for free.

2. Click on the button which says Add To Firefox (Mozilla Add-On website) other websites may have different text on the button.

3. (Skip to Step 4 if you are downloading the add-on from the Mozilla Website) If you are downloading from a personal website website you will be asked to verify that website.  Make sure a website is a trusted one before installing.

4. Once you click the button a window will appear with a countdown on the install button wait for the countdown and then click install.

Click here to view My Top 5 Firefox Add-Ons

1 Aging Tabs: This add on is great if you are a Firefox user that opens a lot of tabs.  Tabs fade away in colour if they are not being used.
Link: https://addons.mozilla.org/en-US/firefox/addon/3542

2 DownThemAll: A download manager and accelerator that works within the Firefox browser.
Link: https://addons.mozilla.org/en-US/firefox/addon/201

3 Flashblock: Some websites are full of flash video and you may not want these to automatically play.
Link: https://addons.mozilla.org/en-US/firefox/addon/433

4 Image Zoom: Great if you need to zoom in our out on images.  To zoom in or out on an image you can simply hover over an image and press down the right mouse button and scroll up or down with the scroll wheel.
Link: https://addons.mozilla.org/en-US/firefox/addon/139

5 NoScript: Used as a security measure and if you do not want javascript to run on certain webpages.
Link: https://addons.mozilla.org/en-US/firefox/addon/722

[Bonus] 6 ImgLikeOpera:
The Opera browser has a great feature where you can turn off images, get this feature in Firefox with this add-on.
Link: https://addons.mozilla.org/en-US/firefox/addon/1672

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