By unchecking the "Open unrequested windows" option in Mozilla, you could disable pop-up ads on sites like weather.com. I also found that this setting in Mozilla was respected in Netscape (even though ability to change this preference setting is not in Netscape). I found out that you can have Chimera do the same thing by placing the following two lines in the "prefs.js" file for Chimera:

  user_pref("dom.disable_open_during_close", true);
  user_pref("dom.disable_open_during_load", true);

I pasted them in so they would be in alphebetical order with the existing lines in the file. Worked like a charm!!