I love Firefox for many reasons but while coming to block pop-up’s it still lag behind in blocking pop-up’s compared to ie8 n Opera but u make king bloom once again with simple tweaks. So if you want to block pop-up’s from Firefox completely, then check out these Firefox hacks
1. Type about:config into the Firefox location bar.
2. Right-click on the page and select New and then Integer.
3. Name it privacy.popups.disable_from_plugins
4. Set the value to 2.
The 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 white listed sites.
So choose the number u want depending on level u want to block pop-up’s on Firefox