Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.9a1) Gecko/20050910 Firefox/1.6a1 Filing as security-sensitive because: (1) The behavior might be a spoofing hole by itself. (2) I haven't checked the behavior on other platforms. (3) The behavior might be the result of memory corruption, which could be a severe security hole. (4) The testcase includes code from bug 306939 as well as other code that I might want to keep secret for a while.

Firefox will stop repainting while the status bar counter says 2149. You will be able to tell that it has stopped repainting because (1) the status bar counter never shows 2150 and (2) clicking the browser's Home button makes the titlebar show your homepage's title.

No ill effects on Windows. Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a1) Gecko/20050908 Firefox/1.6a1

WFM Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.9a1) Gecko/20051005 Firefox/1.6a1.

WFM Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.8b5) Gecko/20051005 Firefox/1.4.1

trunk sept 26: stops repainting Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.9a1) Gecko/20050926 Firefox/1.6a1 trunk sept 27: no problems Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.9a1) Gecko/20050927 Firefox/1.6a1 I don't know which checkin made it work, so marking as WFM instead of DUP/FIXED.