Hi no info came about your add-ons and how many has the add-on moved to the Overflow Menu >> http://techdows.com/2017/06/firefox-photon-new-overflow-menu-and-customize-mode.html

Please let us know if this solved your issue or if need further assistance.

Did you check the Options/Preferences of this extension on the about:addons page?

Open the Customize window and set what toolbars (Show/Hide Toolbars) and toolbar items to display.

• Right-click empty toolbar area -> Customize
• "3-bar" menu button -> Customize
• View -> Toolbars
  *you can tap the Alt key or press the F10 key to show the hidden Menu Bar temporarily

• if missing items are in the Customize palette then drag them back from the Customize window to the toolbar
• if you do not see an item on a toolbar and in the Customize palette then click the Restore Defaults button in the Customize palette window to restore the default toolbar set.

See also:

• https://support.mozilla.org/en-US/kb/customize-firefox-controls-buttons-and-toolbars
• https://support.mozilla.org/en-US/kb/navigation-buttons-missing