Can't install scripts with the "install" button

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lalalove User
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Hi,

I just started using Greasemonkey and I have no idea whether it's me failing or something else.. but I can't install scripts with the "install" button. When I'm asked if I want to install the script and I accept, nothing happens. No pop up.

The only script I was able to install so far, was this one https://www.userscripts.org/scripts/show/12917 by clicking on the hosted version.

Please help! ^^;