Installing extensions

From MozillaZine Knowledge Base
Jump to navigationJump to search

By default, extensions are installed for the current user only, but they can also be installed across multiple profiles and even globally.

Once installed, extensions can be configured by opening the Extensions Manager ("Tools -> Extensions"), selecting the extension from the list, and then clicking the "Options" button. (If this button is disabled then the extension is not user-configurable.) If you experience problems installing or updating an extension you should consult the author’s home page for that extension to see if there are any relevant known issues.

Single-user installation

To install an extension in the current user profile, simply activate the installer file (which has a ".xpi" file extension) within Firefox. This can be done by clicking on a link to an installer file (such as the "Install" button on Mozilla Add-ons) or by saving the installer file to your computer and dragging it into any Firefox window or opening it from the File menu.

Extensions installed in this way will not appear in any other profiles which currently exist or which are later created.

Multi-user installation

Multi-user installations are useful if more than one person uses your Firefox application. You should install and use the Mr Tech Local Install extension to configure your extension installations for multiple users. Alternatively you could simply allow multiple users to use the same profile; you must ensure that the profile folder is accessible to each of them on your system.

Global installation

A global installation will install an extension to the application directory rather than within a profile, so it will be available to all users. To perform a global installation you should not activate the .xpi installer file within Firefox. Instead, download and save it to disk and ensure that you close Firefox completely. Then restart Firefox with the following command line arguments:

-install-global-extension "<path-to-extension>\extname.xpi"

where "extname.xpi" is the name of the installer file.

Depending on the extension, each user may need to configure a globally-installed extension independently.

Changing installation status

If you wish to change the installation type of an extension from single-user to global (or vice versa), or move or copy it from one user profile to another, you should uninstall the extension and perform one of the installation methods above.

Advanced users may wish to try moving the extension files manually between the appropriate locations, as described below. Note that although this procedure should work on Firefox 1.5 and perhaps on Firefox 1.0.x, it is not guaranteed, and it could break your extension, your profile or even your application.

Location of extension files

Extension files are located in the "extensions" subfolder of the profile folder (single-user) and in the "extensions" subfolder of the installation directory (global); there is one folder per extension, named using their ID codes. To tell which is which, look inside each folders "chrome" subfolder where you will find some human-readable information regarding the extension.