User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; rv:1.7.3) Gecko/20040913 Firefox/0.10.1 Build Identifier: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; rv:1.7.3) Gecko/20040913 Firefox/0.10.1 If the browser follows a link that should result in a download, and the browser is already open by another user (via OS X's multiple users), then it crashes. Selecting "save this link as..." from the pop-up menu allows correct download without crash. Reproducible: Always Steps to Reproduce: 1. Create two OS X user accounts on the same machine. The primary account must be admin. 2. Enable fast user switching (System Preferences) 3. Install Firefox using primary account 4. Launch Firefox in primary account 5. Switch to secondary account, leaving Firefox open 6. Launch Firefox in secondary account 7. Navigate to any link that results in a download starting (ie FireFox download, Sourceforge project downloads, etc) 8. When the download should begin, Firefox crashes *. Navigate to the same link, but "Save link as..." instead of clicking the link. The file downloads correctly. Actual Results: Firefox crashes before starting download. Expected Results: Firefox behaves as if user had chosen "Save link as..." from the pop-up menu. Talkback crash ID: TB1532311W

WFM with 1.0

WFM (Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8a5) Gecko/20041121 Firefox/0.9.1+)

Works for me with latest nightly: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.9a1) Gecko/20050925 Firefox/1.6a1 In fact this bug describes the exact setup I used to test bug#263830 .