User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; fr-FR; rv:1.7.12) Gecko/20050919 Firefox/1.0.7 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; fr-FR; rv:1.7.12) Gecko/20050919 Firefox/1.0.7 This must probably appear also on other websites which use the same kind of button. I start with the window maximised, clic on the Report button of google adsense, when the table appears, the windows is resized, and its position moved (around 100px bottom right further). Reproducible: Always Steps to Reproduce: 1. Log on google adsense 2. Be sure your window is maximised 2. Click on the report button 3. Your window is moved and resizes Actual Results: The window is moved and resized Expected Results: Nothing with the window size and position. I can't be sure that firefox is guilty with this weird beaviour, this may also come from the MS Window window system.