User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2) Gecko/20021127 Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2) Gecko/20021127 Appears to be corruption of XUL.mfasl possibly related to bug 167523 and 178208 but since it was different circumstances I thought I should file a new bug Deleting XUL.mfasl corrects the problem. I also had this happen under Phoenix 0.4. I have kept the XUL.mfasl file in question if it will help. Reproducible: Always Steps to Reproduce: 1. start browser 2. open preferences Actual Results: menu remains on screen, mozilla hangs, requires kill Expected Results: let me edit preferences classic theme, Xft build, RedHat 8.0 GNOME 2 install. Unlikely related to Xft as it occured in Phoenix 0.4 as well as a separate incident.

Same behavior seen in Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.2.1) Gecko/20021130 Have Phoenix 0.4 installed also. Removed XUL.mfl from profile to fix the issue.

I had this problem today too and deleting XUL.mfl fixed the problem I dont know what caused it in the first place tho preferences had been working fine earlier in the day v1.2.1, win98

Same for me on a german W2K box, Phoenix is not installed. I always update via the zip-file. Mozilla 1.3a Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.3a) Gecko/20021212 roland

Same thing for me on Windows 2000. If I let it run for awhile it will consume all the memory and virtual memory Windows will give it. Moving xul.mfl to a different directory also worked for me. This is my first time using Bugzilla. I'm very glad to have found this bug and to see that others have left the info with the work around here. Thanks guys.

Yes, same problem here on Windows ME running Mozilla 1.21 . Starting at one point and then happening every time aftewards choosing Edit -> Preferences seemed to freeze Mozilla. Renaming XUL.mfl to oldXUL.mfl fixed it and a new XUL.mfl was auto-created. Just as a note it looks like the bug # referenced in the first post is now at <A HREF="http://bugzilla.mozilla.org/show_bug.cgi?id=169777">169777</A>. Thanks for the tip people, what a life-saver.

I seem to have a similar problem with my Mac OS X installation of Mozilla. On that box it immediately quits Mozilla when I attempt to open the preferences. I searched for both the xul.mfl and xul.mfasl files but could not find any. Any other suggestions? Thanks, Chris

Hi Chris, I; not familiar with OS X, but I suppose you should find the XUL.mfasl file in your Home-directory as in Unix. This should be <yourhomedir>/.mozilla/<mozilla-user-account>/<random-directoryname>/XUL.m* on my linux the ext. is mfasl, on win its only mfl Hope That Helps, Roland

I found it in Mac OS X.<My home directory>/Library/Mozilla/Profiles/<random directory>/XUL FastLoad FileThanks, again guys.Chris

In 1.3a on MacOSX, Preferences... hangs in cpu loop; have to Force Quit.

*** This bug has been marked as a duplicate of 169777 ***