Yes popups is a Firefox extension that quickly toggles the most restrictive anti-popup options on and off: to toggle popups on/off, either click on the icon or press CTRL+SHIFT+Q.
This is updated version of extension(see changelog bellow), developed by David Dernoncourt. See http://www.patheticcockroach.com/mpam4/index.php?p=64
To install this addon go to Tools -> Add-ons -> Extensions. Press button at the right side and select "Install Add-on From File"
Attention! Starting from Firefox 42 browser block installing unsigned addons. To disable this type in Address bar - about:config Search for xpinstall.signatures.required and double click on it(must be set to false).
"Why I must to do this?" See https://wiki.mozilla.org/Add-ons/Extension_Signing and https://support.mozilla.org/en-US/questions/1078289
- Added support for latest Firefox versions(Firefox 2 and later, including modern 30+ and 40+ versions).