You may have inadvertently moved the Firefox View button from the Tab bar to the Customize palette or overflow area. *https://support.mozilla.org/en-US/kb/how-set-tab-pickup-firefox-view Open the Customize page 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<br>*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 page to the toolbar *if you do not see an item on a toolbar and in the Customize palette then click <u>Restore Defaults</u> in the Customize palette window to restore the default toolbar set. *https://support.mozilla.org/en-US/kb/customize-firefox-controls-buttons-and-toolbars