From Bugzilla Helper: User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:0.9.2) Gecko/20010628 BuildID: 2001062815 Enhancement request: Konqueror, the browser from KDE, added a feature to ignore the javascript command to open new windows (usually used for ads). It would be nice to have this ability in Mozilla, under the browser preferences. Additionally, it might be nice to have an option to ask the user first. Reproducible: Always Steps to Reproduce: 1. Go to http://www.intellicast.com/ and browse. 2. You will soon see a popup ad in a new window.

*** This bug has been marked as a duplicate of 75371 ***

This looks like a dupe of Bug 75371. If you want to disable it for the meantime though, read the relnotes.

John, for your personal reference, this was pulled from http://www.mozilla.org/releases/mozilla0.9.2/ The syntax for blocking pop-up windows has changed since Mozilla 0.9. To block pop-up windows, add this line to the prefs.js file in your Mozilla profile directory while Mozilla is not running: user_pref("capability.policy.default.Window.open", "noAccess"); If you want to allow specific sites to open new windows, add the line above and also these lines: user_pref("capability.policy.allowpopups.sites", "http://www.mozilla.org http://bugzilla.mozilla.org"); user_pref("capability.policy.allowpopups.Window.open", "sameOrigin"); See the Configurable Security Policy documentation for more information. (http://www.mozilla.org/projects/security/components/configPolicy.html)

Verified Duplicate. Also see bug 29346, "Prevent repeating pop-up windows"