Firefox has this feature to block all pop-ups from all sites and provides you with the freedom to choose what you want to do with it. This article may help you understand about the feature and how you can control it: http://mzl.la/1BAQuEQ

Hope this helps! Please report back to us!

tnq but I read this article and I can't stop pop-up blocker completely I add My site to Exceptions and I uncheck block pop-up windows but it's still block some pop-up for example this block 10 of 30 or more pop-up

Do you have any blocking programs or add-ons? What about your protection programs?

Can you give a link to a page where Firefox is blocking a pop-up?

On the Options page, Content panel, "Block pop-up windows" refers to independent new windows. It would be extremely unusual for a single page to launch 30 new windows.

If the problem is with script dialogs, the kind that sometimes have a checkbox to not show any more dialogs, those are controlled by a different preference. You can try modifying it here:

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful.

(2) In the search box above the list, type or paste pop and pause while the list is filtered

(3) Double-click the dom.popup_maximum preference and change the default maximum of 20 to your preferred value

You might have to reload the page in order for this to take effect.