Type Faster on an iPhone or iPod touch
When typing on an iPhone or iPod touch, to end a sentence quickly and get ready to start the next one, double tap the Space bar. You'll insert a period followed by a space. You can turn this shortcut on or off via the Shortcut slider in Settings > General > Keyboard.
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However, gray text in the interface usually indicates static text, which is not the case for URLs in the Firefox address bar. In the "Bug or Feature" contest this ranks as a fug (kind of a feature, but mostly a bug). Also known as a UAHSE (usability analyst's head-space error).