This extension works absolutely fine in Firefox 57+.
Download Star is amazing and will continue to get better.

Don't be put off by any negative reviews - yes it's a work in progress but it's functional as is.

For those having "issues" with downloads not starting, I noticed that on Windows if you do not have a trailing slash in your path, Download Star won't begin. Not sure if it's a Windows quirk or an extension issue, but it's not a big deal to workaround.

However, you can create your own path or use the default path as long as you make sure wherever you choose to save your downloads it has a trailing slash.

i.e.

MyDownloadLocation won't work

MyDownloadLocation\ will work

5 stars, keep up the great work!