strange blank pop up in firefox

[dogbone]

Suddenly on one particular website only. Whenever I click any links I get this annoying warning pop up which tells me nothing. Any clues on what could be causing this?

 

[iSaint]

the site's down?

edit: works for me

 

[dogbone]

No, the site is working normally and the pages I click on come up OK but this pop up keeps appearing. Funnily enough it only happens on all the links from the main home page.

 

[clevin]

safari does the same thing,
u can try use noscript extension to prevent that site from using javascripts tho