Firefox add-ons are small pieces of software that add new features or functionality to your installation of Firefox. Add-ons can augment Firefox with new search engines, foreign-language dictionaries, or change the visual appearance of Firefox. Through add-ons, you can customize Firefox to meet your needs and tastes.
This article covers the two types of add-ons: extensions and themes.
- Extensions provide additional functionality to the Firefox application.
- Themes change the visual appearance of Firefox.
Firefox 3:
- Plugins manage internet content that Firefox is not designed to process.
Table Of Contents
Acquiring add-ons
You can acquire new extensions and themes through Firefox itself:
Firefox 3:
- At the top of the Firefox windowOn the menu bar, click the Tools menu and select Add-ons, to open the Add-ons window.
- In the Add-ons window, the list of recommended add-ons is displayed.
- If the Get Add-ons panel is not already selected, select it.
Firefox 2:
- At the top of the Firefox windowOn the menu bar, click the Tools menu and select Add-ons to open the Add-ons window.
- In the Add-ons dialog, the list of currently installed extensions is displayed.
- By default, Firefox includes a single extension. The Talkback extension enables you to send messages about your experience using Firefox to its team of developers.
- To see the list of available themes, click the Themes tab. Themes are described in detail later.
- To acquire new extensions, click Get Extensions.
- The Firefox extensions page is displayed. Through this page, you can access a very large collection of extensions and other items available for download.
Finding and installing add-ons
Firefox 3:
- In the Get Add-ons panel of the Add-ons window, search for an add-on by typing the search term in the Search All Add-ons field, then press EnterReturn. A list of add-ons matching your search term will display.

- To begin installing an add-on, select it and click on Add to Firefox....

- You may be required to review and accept the End User License Agreement. To continue with the installation, click Accept and Install.
- Firefox will then fetch the add-on, and display the Software Installation window. To begin the installation, click Install Now.

- After the installation is complete, you must restart Firefox to start using the new add-ons. To restart, click Restart Firefox that appears after installation is complete.
- When Firefox restarts, the installed add-on is displayed with previously installed ones.
You can also browse and install add-ons by clicking on Browse All Add-ons, which will take you to the Firefox Add-ons page.
- In the Firefox Add-ons page, you can find new add-ons in the following ways:

- By default, the page displays the available Firefox extensions. To search for different types of add-ons, click one of the following links in the left navigation bar:
- Themes change the appearance of Firefox. They are discussed below.
- Dictionaries allow you to check your spelling in additional languages.
- Search Plugins allows you to add more search engines to the search bar.
- A list of recommended add-ons is available. To see more click View All.
- To browse a category of extensions, select the category name under the Category Panel on the left side.
- To search for an add-on by name, type the name in the search box. Then, click Enter.
- A list of most popular add-ons is available. To see more click View All.
- To begin installing an add-on, click its name on the page. Detailed information on the add-on is displayed.
- Firefox automatically verifies add-ons compatible with your version. If the button is grayed out, the add-on is not compatible with your version.
- To begin installing the add-on, click the green Add to Firefox button.
- You may be required to review and accept the End User License Agreement. To continue with the installation, click Accept and Install.
- After the installation is complete, you must restart Firefox to enable the add-on. To restart, click Restart Firefox at the bottom of the Add-ons window.
- When Firefox restarts, the installed add-on is displayed with previously installed ones.
Fashion Your Firefox
Fashion Your Firefox is a simple Web application that customizes your Firefox browser based on your interests and online activities. Fashion Your Firefox helps you select add-ons that fit your needs, and enables you to install them with just one click.
For more information about the application, visit fashionyourfirefox.com. There you can find a list of frequently asked questions.
To find out where the Fashion Your Firefox add-ons are located, take a look at a map which illustrates the parts of Firefox where your Fashion our Firefox add-ons may be found.
Managing extensions
Extensions add new functionality to Firefox and can appear in different locations on the Firefox screen. For example, new toolbars appear at the top of the Firefox window.
- New buttons or functions may be hidden initially. For more information on displaying them, see Customizing the toolbar.
After you have downloaded and installed Firefox extensions, you can manage them through the Add-ons window.
Note: You can download and install any number of Firefox extensions. However, each installed extension requires additional memory. If you install too many extensions, Firefox performance may be impacted.
- To manage your extensions, click the Tools menu, and select Add-ons.
- In the Add-ons window, select the Extensions panel, if it is not already selected. The set of installed extensions is displayed.
- To temporarily disable an extension, select the extensions, then click Disable. When Firefox is restarted, this extension is disabled.
- To re-enable a disabled extension, select the disabled extension, and click Enable.
Checking for extension updates
To check for extension updates, select the Extensions panel, at the top of the Add-ons window. Then, click Find Updates at the bottom. Firefox checks to see if updates to the extensions are available.
Extension optionspreferences
If an extension offers configurable optionspreferences, you can review and change them by selecting the extension, then clicking OptionsPreferences.
In the OptionsPreferences screen for the extension, you can change optionspreferences for the extension.
Note: After you install an extension, you should review its available optionspreferences, as they may affect how the extension functions.
Firefox 3:
Switching themes
Themes change the visual appearance of Firefox. They can be found and installed through the Add-ons window.
Note: A theme affects the visual appearance of every screen and dialog in Firefox.
After you have downloaded and installed Firefox themes, you can manage them through the Add-ons window.
- At the top of the Firefox windowOn the menu bar, click the Tools menu, and select Add-ons to open the Add-ons window.
- In the Add-ons window, click the Themes tab.

- Select the theme you want to use.
- Click Use Theme.
- Click the Restart Firefox button that will appear.
Firefox 2:
Managing themes
Themes change the visual appearance of Firefox. They can be found and installed through the Add-ons window.
Note: A theme affects the visual appearance of every screen and dialog in Firefox.
- At the top of the Firefox windowOn the menu bar, click the Tools menu, and select Add-ons to open the Add-ons window.
- In the Add-ons window, click the Themes tab.
- When Firefox is installed, a single default theme is included.
- You can look for themes and other add-ons in the Add-ons page. When the installation is complete, the new theme is displayed in Installation section of the Add-on window.
- Click the Themes tab, and select the new theme.
- Click the Use Theme button, to make Firefox switch to that theme, when installation is complete.
- Click the Installation tab.
- Click the Restart Firefox button, at the bottom of the Add-ons window, to complete the installation.
Using themes
To use a theme, open the Add-ons window, by clicking on the Tools menu, at the top of the Firefox window, and selecting Add-ons. Click the Themes tab, then select the theme you want to use. Then, click Use Theme. To complete the switch, you need to close Firefox, and start it again. When Firefox restarts, the new theme is in use.
Firefox 3:
Managing Plugins
Plugins are small programs that can be added to browsers like Firefox to manage Internet content that Firefox is not designed to process. Some examples are Flash, Java, and QuickTime. For more information, see Popular plugins.
In the Add-ons window, you can enable and disable individual plugins.
- At the top of the Firefox windowOn the menu bar, click the Tools menu, and select Add-ons to open the Add-ons window.
- In the Add-ons window, select the Plugins panel.

- To disable a plugin, select it, and click Disable.
- If the plugin is already disabled, there will be an Enable button.
You do not have to restart Firefox for enabling and disabling of plugins to take effect.
Troubleshooting
For help troubleshooting problems, see these articles.
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