I use Firefox instead of IE is to get rid of pop up ads.

unfortunately, there are many pop under ads now. a pop under ad is a pop up ad that pops under(behind) your current browser. It is very annoying.

I google and found a solution, thanks to Pete Bevin in Canada for his findings.

The culprit is the Adobe Flash Plugin, add 2 lines of code to your Firefox config to disable the pop under ads until they find another way to pop.

open a new tab(or in current tab if you wish)

in url, type: about:config (this will open up Firefox’s config setting)
right mouse click anywhere on this page, select NEW and Integer
Name this new integer “privacy.popups.disable_from_plugins” (without quotes)
set the value to 2.

other possible values are:

0: Allow all popups from plugins.
1: Allow popups, but limit them to dom.popup_maximum.
2: Block popups from plugins.
3: Block popups from plugins, even on whitelisted sites.

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