Ads in 'Special' section don't direct to anywhere

I recently deleted Explorer from my pc and realized that the ads in Special button don’t open in Firefox. The warning window about the external link pops up fine but nothing happens.

Any idea why?

We’ve checked this. All good with firefox. Maybe you need to update your browser? If it still doesn’t work, please write a bug-report in the special section. 

Aaahh… I found out why. It wasn’t my default browser… even though it was the only one installed. Thank you for looking into this anyway.