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F11: Full screen mode (Firefox)
In Firefox, tap the F11 key and all of a sudden, plenty of screen clutter disappears, allowing you to view the current web page without as much distraction.
Sure, there’s the tool bar (and possibly the tab bar, if more than one tab is open) on the top, and the find bar (if open) on the bottom. But other than that, just you and your web page.
Hit F11 again to turn full-screen mode off.