Check if webGroup exists rather than checking the pref, as the pref can change (though it shouldn't). 
Check if webGroup exists rather than checking the pref, as the pref can change (though it shouldn't). 
ycaihua/skim-app,ycaihua/skim-app,ycaihua/skim-app,WoLpH/skim,ycaihua/skim-app,ycaihua/skim-app,WoLpH/skim,WoLpH/skim,WoLpH/skim,WoLpH/skim