the download speed still is way slower than downloaders like IDM and also there is no options to customize it.

It said to put in the urls of the videos. I did. I clicked to download and it downloaded them so fast that I knew it hadn't downloaded anything. I clicked on one and the computer couldn't open it because, duh, the file extension was "file" and there wasn't really anything there.

I was loving it and I do still love it 95% of all times. It has some bugs that need to be resolved (see other reviews), but the developer has been vanished. So, this is a zombie.

I removed this addon.

Some sites like virustotal.com is not working as Sopor said below, and some sites require multiple attempts to load. so, I recommend remove this addon.

no option to auto-rename downloading files. with mask or simple (n+1)

view. +-. have seen more ugly

If enable some sites won't work. One of them that won't work is virustotal.com
I did found a work around. Add virustotal.com to "Hide Download Bar on following web pages".

Very useful except for one big flaw: no option to disable the confirmation window when you open a file. I clicked on it, yes I want to open it, you don't need to waste my time with a pop-up window.