How to restore the new tab button that usually is on the right of the tab list (+)
As you can see from the screenshot I don't have the new tab button (+), I've seen other users had the same problem in the past and the solution was restoring it from the customization page, but I can't find it there neither.
Wybrane rozwiązanie
Right-click on a toolbar or the 3 bar menu then Customise Toolbar. You will see an icon for new tab; it looks different on the Customise page. Drag it to where you want it on the toolbar.
https://support.mozilla.org/en-US/kb/customize-firefox-controls-buttons-and-toolbars
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Wybrane rozwiązanie
Right-click on a toolbar or the 3 bar menu then Customise Toolbar. You will see an icon for new tab; it looks different on the Customise page. Drag it to where you want it on the toolbar.
https://support.mozilla.org/en-US/kb/customize-firefox-controls-buttons-and-toolbars