See:

• https://support.mozilla.com/kb/common-questions-after-updating-firefox

Firefox 4 and later use a combined Stop/Reload/Go button that is positioned at the right end of the location bar.
During the page load process it shows as a Stop button and after the loading has finished the button is changed to a Reload button.
If you type in the location bar then that button becomes a Go button.
Middle-click the Reload button to duplicate the current tab to a new tab.

Thank you very much. This relieves a lot of frustration.

Rick

This can be closed.

Thanks Rick

why not just leave the old buttons? This is ridiculous to have to spend hours looking for a button that is not there. There is no stop/reload button in the customize window either. I would much prefer to have separate buttons like before

synergytax, The Stop and Reload buttons as said above may likely be on far right end of your Location (address) bar. With the Customize window open you can move the Stop and reload buttons to almost anywhere you want.

If you want them side by side after moving them and not combine. Either place them as Stop then reload or if Reload the Stop place something in between like a flexible space to keep them from combing.