I got the same problem too, i'll go check whit an other browser (tho i doubt itll change anything XD) and ill edit this post.
EDIT : ye same problem on other broswer ... anyone still can download it fine ?
EDIT2 : cant download any other addon either...
I use Windows 7 so I can download it just fine. Here's my download (direct from my downloads file). P.S: its Windows 7 Home Premium.