Mozilla crush!

Hi!

I have problems with mozilla and MozillaFirebird. Both crush periodically with messages:

1) mozilla -

Warning: Cannot convert string "6x13*font: 6x13*font: 6x13*font:
6x13*font:" to type FontStruct

Warning: Actions not found: addBookmark, viewBookmark, copy, undefined-key, find, findAgain, history, loadImages, openURL, mailNew, new, openFile, print, exit, reload, saveAs, paste, delete, cut, undo, historyItem, back, forward, abort, PageUp, PageDown

Warning: Actions not found: ManagerGadgetNextTabGroup, ManagerGadgetPrevTabGroup, DrawingAreaInput, addBookmark, viewBookmark, copy, undefined-key, find, findAgain, history, loadImages, openURL, mailNew, new, openFile, print, exit, reload, saveAs, paste, delete, cut, undo, historyItem, back, forward, abort, PageUp, PageDown

Warning: No action proc named "ManagerGadgetArm" is registered for widget "form"

X Error of failed request: BadWindow (invalid Window parameter)
Major opcode of failed request: 18 (X_ChangeProperty) Resource id in failed request: 0x3e00160
Serial number of failed request: 2049
Current serial number in output stream: 2080

/usr/lib/mozilla-1.6/run-mozilla.sh: line 451: 4028 Killed "$prog" ${1+"$@"}

2) MozillaFirebird - /usr/lib/mozilla-firebird/run-mozilla.sh: line 454: 4093 Killed "$prog" ${1+"$@"}

Any suggestions will be appreciated.
Thanks in advanced.

ENV: Fedora Core 1, Mozilla 1.6, MozillaFirebird 0.7

Best regards,
Michael Stepanov,
Perl/Linux Developer
Francoudi & Stephanou Ltd.