"Ctrl-V - Enter" behaviour in new tab.

[Mario Sottile]

Hello, there. With my last Firefox update (49.0, Ubuntu-Mate 14.04 x64), 
I found something annoying...
Sometimes, I select some text, I press: Ctrl-C, Ctrl-T, Ctrl-V, Enter 
key. Before the update, Firefox went inmediatly to the address or 
searched that text in google.
Now, the Enter key has no effect. I have to wait some time for Firefox 
to accept it and does what it has to do.

If I press Ctrl-T, enter some quick and random text and press Enter, it 
works. But it doesn't by pasting text.

Why this is like this now? I know that now it is different the way that 
Firefox treats the entered text... but *Ctrl-V, Enter* is *Ctrl-V, Enter*.

Is this a bug?
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