|Summary:||tab close button 'x' incompatible with some systems.|
activating the pref:
triggers a km crash on some systems
first discovered by jamesd and confirmed by alex tartar, it appears to happen on some xp systems.. other systems may also suffer but it has not been confirmed on win9x, 2k or vista
it's also unknown whether other 1.5 versions(1.5.1, 1.5.2 ) can trigger that crash.