Bring back the normal Menu bar or go to Firefox button and View->Toolbars and Customize.
With the Customize window open you can then drag and drop toolbar items on/off toolbars.
This include the Stop and Reload buttons that should be in far right of the Location (address) bar.

To keep the Reload and Stop buttons from combining just either put a flexible space in between or set them at Stop then Reload.

Open the Customize window via "View > Toolbars > Customize" or via "Firefox > Options > Toolbar Layout"

• http://kb.mozillazine.org/Toolbar_customization
• https://support.mozilla.com/kb/Back+and+forward+or+other+toolbar+items+are+missing

Thank you So much for your help, all back to how it should be now Regards