Clicking on the "menu" part of the bookmarks menu button also triggers mouseup events on the "arrow" part of the panel styling, which gets recorded as a click on the BMB_bookmarksPopup, which is the same ID that clicks on actual bookmarks are put under. That's no good. Bug 941049 might fix this. I'll know once a patch gets put up for it. At the very least, we could subtract the clicks that we record on the menu from the clicks that we record from the popup.
4 years ago