Different page layout Safari vs. FireFox?

Safari seems buggy compared to Firefox. When first opening new song page and clicking on Remixes, a red "1" appears on Bookmarks next to the envelope but the remixes tab needs to be clicked several times to open. In Firefox, there are no 4 items including Bookmarks in the upper left. Also, when clicking on the Bookmarks with the now showing red "1", clicking the "X" to delete this entry has no effect.

Perhaps Safari should be not used because it causes too many problems relative to programming for FireFox?

---