Add-ons or Plugins are used to extend Firefox’s functionality. Firefox allows to enable or disable installed plugins through its “Add-ons Manager”.
This article explains the steps to Enable or Disable Add-ons.
Step 1. Open Mozilla Firefox browser application.
Step 2. Click on the Firefox icon which is on the top left corner of the window. Firefox will display a pull-down menu.
Step 3. From the Firefox menu, click on the “Add-on” menu item. Firefox will display the “Add-ons Manager” page.
Step 4. Click in the Plugins tab from the left side of the page. Firefox displays the list of Plugins installed on the right side of the page.
Step 5. Select the plugin you want to enable or disable and click on the combo-box which is next to the plugin. Select the value Always Activate to enable the plugin. By selecting the Never Activate value, you can disable the plugin. Ask to Activate will prompt you before activating the plugin.