Looking at my user defaults, I noticed a bug where we make a new page group identifier almost every time. This code seems like the culprit: unsigned WebInspectorProxy::inspectionLevel() const { auto findResult = pageLevelMap().find(inspectedPage()); if (findResult != pageLevelMap().end()) return findResult->value + 1; return 1; } Defaults: "__WebInspectorPageGroupLevel1000__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1000__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1001__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1001__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1002__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1002__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1003__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1003__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1004__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1004__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1005__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1005__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1006__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1006__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1007__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1007__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1008__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1008__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1009__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1009__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel100__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel100__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1010__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1010__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1011__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1011__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1012__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1012__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1013__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1013__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1014__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1014__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1015__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1015__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1016__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1016__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1017__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1017__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1018__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1018__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1019__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1019__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel101__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel101__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1020__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1020__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1021__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1021__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1022__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1022__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1023__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1023__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1024__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1024__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1025__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1025__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1026__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1026__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1027__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1027__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1028__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1028__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1029__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1029__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel102__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel102__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1030__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1030__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1031__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1031__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1032__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1032__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1033__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1033__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1034__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1034__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1035__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1035__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1036__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1036__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1037__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1037__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1038__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1038__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1039__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1039__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel103__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel103__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1040__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1040__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1041__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1041__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1042__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1042__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1043__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1043__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1044__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1044__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1045__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1045__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1046__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1046__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1047__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1047__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1048__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1048__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1049__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1049__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel104__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel104__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1050__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1050__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1051__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1051__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1052__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1052__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1053__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1053__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1054__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1054__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1055__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1055__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1056__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1056__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1057__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1057__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1058__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1058__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1059__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1059__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel105__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel105__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1060__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1060__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1061__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1061__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1062__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1062__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1063__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel1063__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel1064__.WebKit2AllowFileAccessFromFileURLs" = 1; ... "__WebInspectorPageGroupLevel998__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel998__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel999__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel999__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel99__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel99__.WebKit2ApplicationChromeModeEnabled" = 1; "__WebInspectorPageGroupLevel9__.WebKit2AllowFileAccessFromFileURLs" = 1; "__WebInspectorPageGroupLevel9__.WebKit2ApplicationChromeModeEnabled" = 1;
<rdar://problem/24743204>
Joe did no see similar on his machine. I deleted these and will watch to see if they come back. They could have been created by older version of the code.