Is there any way to apply to only certain domains? For example, I can set up a list of domains, and only the domain in this list will enable this extension.

i really enjoy it...

NeatDownloadManager By J. Motallebi is the simplest, but the most useful download manager add-on for Firefox installed on a Mac OS so that it can help you download directly and instantly from any website, just by one click on an intended download link.