The menus in firefox are NOT skinned by WindowBlinds.  If you have problems with those then it will be a skin colour scheme choice issue.  There is nothing WB can do about that and you would get the same result in Windows Classic if you set the colour scheme the same.

Regarding the favorites menu, I thought I had already explained that its not a menu (its a toolbar) and so it cannot support per pixel alpha like the normal menus can.  WB is skinning them without the alpha though and it has a special section just for those 'menus' so a skin can make them look better if they use alpha in the main menus.

Regarding the misplaced arrows, does this happen in both explorer & IE?  Finding out which item has arrows is complex, so its possible its picking the wrong item sometimes.  The code is identical to the WB4 code though.