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Firebird quirk

OK, I've looked everywhere I can think of and I cannot figure this one out.

What would make Firebird running on Win 2K pop up an alert with what looks like the form URL just about every time I click a submit button? This seems to happen when there's javascript involved in the form, and sometimes after I dismiss the alert, the action still gets posted, sometimes not. Repeated clicking can sometimes get the action to go through, sometimes not; I haven't seen a recognizable pattern. I've done a Google search, read over the prefs.js and user.js file, and haven't been able to dig up anything that seems relevant to the problem. It's very annoying. I unfortunately can't remember when exactly it started happening, because I've been using my iBook at work for a while and Safari didn't give me this trouble. Any light anyone could shed on this would be much appreciated.