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This is an awesome extension, but I have a concern. The addon works perfectly, but when I Run something then visit my Downloads history and click the "Open file location" button on that download, the containing folder contains older downloads which were "run" and they were complete and still worked, so I am concerned. I download some pretty big stuff, so I'm wondering if the folder is cleared automatically. I don't want to run out of disk space!
Edit: (reply to developer) My Browser was Firefox 29 (while using the extension) and my OS is Vista. I'm sure that the same thing happens with Firefox 28.
Edit 2: fixed some confusing content.

Questa recensione riguarda una versione precedente (3.5.1.1-signed) del componente aggiuntivo. 

Yes it is, as stated on the site.

(Well... it could as well be a bug. Which browser/OS?)