Missing sidebar buttons in Firefox

I have this issue too in FF. When i reload (F5) the page, the icons are visible for a quick moment. But even after several tries i am not able to press any of them. After i have cleared to cookies (also tried with private windows) the fav icon appeared and stays in the sidebar, but the other icons still show for only a quick moment and disappear. Like this: image I have now installed https://aur.archlinux.org/packages/fluxer-bin where i can see all the icons, but in FF there is no change.