User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; rv:1.7.3) Gecko/20040913 Firefox/0.10.1 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; rv:1.7.3) Gecko/20040913 Firefox/0.10.1 In the page http://thesaurus.reference.com/ put text in to the text box, as if you were looking up a word. When you click on "Search" or hit "Enter" then it finds words (as it should) but it also brings up a popup, or, more accurately, a popunder. I'm using XP Pro SP2, on 2 different computers (unfortunately it's the only OS I use). Reproducible: Always Steps to Reproduce: 1. Go to http://thesaurus.reference.com/ 2. Enter a word 3. Click Submit Actual Results: I receive a popup Expected Results: The software should block the ad.

Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7.3) Gecko/20041020 Firefox/1.0 WFM

I can confirm this bug. It is not always reproducible as it depends on what random ad you get. After a couple of tries I got the chance to copy the javascript code causing this problem. You can find an example at http://chasaidthekitty.com/hello/popup2.html (click on 'link' or on 'Submit Query' and the bug manifests itself) The way it works is that the offending javascript adds to the onclick events of all of the links and adds to the onsubmit events of all the forms. This is probably related to https://bugzilla.mozilla.org/show_bug.cgi?id=212163 but this bug was marked as WONTFIX so... Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.3) Gecko/20041024 Firefox/1.0

Popups from the site: http://www.computermail.net/ are not blocked either. Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.7.5) Gecko/20041110 Firefox/1.0 Mozilla Firefox should block this popup, but does not. I'm using MS Win XP Home with SP2 on an AMD K6 Athlon machine.

(In reply to comment #2) > I can confirm this bug. [...] > The way it works is that the offending javascript adds to the onclick events of > all of the links and adds to the onsubmit events of all the forms. onClick and onSubmit are allowed events, right. If you want to change this, edit with about:config the pref dom.popup_allowed_events. *** This bug has been marked as a duplicate of 212163 ***