noscript disappeared + can't be reinstalled

[June28_2014]

Hello,

yesterday my noscript add-on has suddenly disappeared from firefox 30.0 (running on Windows 7 Ultimate, SP1)

I tried to re-install it, but in the add-on-window, I see the installation-bar and it never proceeds from a small green line that indicates a start of an installation.

I haven't found anything on the web or in this forum that relates to this problem

I am using KIS Kaspersky Internet Security An 13.0.1.4190. I haven't changed anything else on my system latelty (except for automatic windows updates).

Can anyone please help me?

Thanks in advance.
June

[Thrawn]

What happens in a new profile?

[therube]

(Temporarily) disable all extensions & plugins.

Can you then install?

[barbaz]

Can you install from http://noscript.net/feed?c=200&t=a