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Installing extensions
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Single-user installation
Firefox: To install an extension in the current user profile, simply click the Install button on Firefox Add-ons or by saving the extension (which has a ".xpi" file extension) to your computer and dragging it into any Firefox window or opening it from the File menu.
Thunderbird: Download the extension, open Add-ons and click its the Install button. Details...
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 application. You should install and use the MR Tech's Toolkit 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 your Mozilla application. Instead, download and save it to disk and ensure that you close the application completely.

Then follow one of the following options:

Restart your Mozilla application with the following command line arguments:
 -install-global-extension "\extname.xpi"
where "extname.xpi" is the name of the installer file.

Copy the .xpi file into the \extensions folder. When you start your Mozilla application again, it displays an installation dialog, asking "The following items were found in your Extensions folder. Do you want to install them?"
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 version 1.5 and above of Firefox and Thunderbird, and perhaps on versions 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 folder's "chrome" subfolder where you will find some human-readable information regarding the extension.

 

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