Don't show "about:newtab" which hides the address bars.

[Mozzy123]

When I click the "+" to create a new tab in Firefox,
"New Tab about:newtab" appears directly below the tab,
which hides the address bar.
This makes the content typed directly into the address bar from the keyboard difficult to see, especially when it's the second tab, so I have to move the cursor.

[Jon]

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