Sometimes toolbar buttons will "overflow" onto a drop-down menu (button looks like a large »). You can use the Customize screen to rearrange buttons if higher priority buttons are overflowing and there are others you prefer to overflow instead. More info on Customize: [[Customize Firefox controls, buttons and toolbars]]. Was that the problem, or are they not there, either? A common problem is when user switch from regular browsing to private browsing, some extensions may need to be given permission to run in private windows. More info: [[Extensions in Private Browsing]].