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About this Add-on
There are a number of limitations in this (early) version. The main one is that Firefox will hang (stop responding) when you click 'start'. Its unfortunately difficult (possibly impossible) to access local files in js when running in a background thread so it has to be run in the main one which causes the browser hang.
This is especially apparent if you try to access a slow or remote mapped drive - Firefox could hang for a few minutes.