I figured out the problem. The addon doesn't work with the latest Abrowser version (20.0) available on Trisquel 4.1 (which I use), nor on the default Abrowser version (19.0), that comes with Trisquel 6.0. After the web-browser (in virtual machine) was upgraded to the latest version (24.0 if I remember correctly), the addon started to work, and the VM froze (old hardware).

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