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This extension adds a button ("Dump list") to the Add-ons window. When this button is pressed, a new window is opened with the list of installed extensions, themes or plugins (as plain text, as HTML, as CSV or as BBCode).
In addition to the name, some other information can be added to the list:

The version number.
The description.
The homepage URL.
The add-on ID.
The add-on install date.
The application (Firefox, Thunderbird...) min and max version.
The add-on status (incompatible/disabled).
The application version and the Operating System.
The total number of installed add-ons.
The date the list has been generated.
The list can be saved, printed and copied to the clipboard.

This extension is useful to keep a list of your extensions and themes, or when reporting a bug or a conflict to an extension author.