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Doesn't Work Anymore w/Alternatives Rated 1 out of 5 stars
I also found this one, https://addons.mozilla.org/en-US/firefox/addon/opendownload-271182/
I was able to find a link on google for the old link to the rundownload-1.2 which was an Experimental Add On that Firefox has since removed from the search results, https://addons.mozilla.org/en-US/firefox/addon/rundownload/.
In the event the above link dies.
I also uploaded the Xpi file to hotfile for anyone who's interested in using it.
Just save the file & tell windows to open with Firefox to install.