Firefox extensions backup does what the name suggests - it allows you to backup the current Firefox browser extensions you may have installed. Once you've identified which Firefox profile you'd like to inspect, you can choose to backup all the extensions or you can be selective and backup the extensions one-by-one. This is handy as you can always later reload the xpi extensions into Firefox manually at a later date.
Download firefoxextensionbackup for 64bit Debian Linux.
As well as needing a 64-bit Debian Linux computer to run this on, you'll also need to keep the ".so" file in the same folder as the application. Normally I try to make all my apps contained in a single file (single application binary), but for this one, it relies on an external zip library.
If you have any suggestions, please get in touch via email. Many thanks.