User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.8.1.7) Gecko/20070914 Firefox/2.0.0.7 Build Identifier: Every Seamonkey i.e. Browser freeze on some particular pages without possibility to interrupt content loading (see attached page). Reproducible: Always Steps to Reproduce: 1. Open attached page. Actual Results: Browser is loading infinitely, and it is not responding, so you cannot even press the 'Stop' button to break the loading process. When you press 'Close' window button, the dialog about not responding is displayed. The attached pages are prepared intentionally in that way in order to test the robustness of browser. Expected Results: Page is loaded and rendered correctly in a few seconds and browser is responding during loading of that page. See attachment.

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.14) Gecko/20080404 Firefox/2.0.0.14 There are w whole bunch of nested marquee tags which is causing the slow-down (although an actual crash, I couldn't reproduce), the bug for the hang is bug #239840.