Works fine for me. What I had missed most of DTA was the bulk download function for links which I found in Download Star. Thank you for your effort in programming an alternative add on.

First I had problems with actually starting the download (mentioned by many users before). Here is what I did to make it happen:

Give a full path (e.g. "C:\Temp\01\") in the destination field did not work (regardless of trailing \ or not). Take the default download destination specified in Firefox' preferences as given! Even if you set firefox' preferences to "ask" Download Star will refer to what was previously set as default. Any phrase typed into the destination field will create a seperate subfolder where the files are stored, leave it blank does not seem to work.

Firefox 57.0.3 (64-Bit), Download Star 1.0.1