Running a game in Firefox - using controls brings up field at bottom?

Hi All and thanks for reading,

I'm new to C3 and tried to run a game. It opened successfully in a Firefox window, but it uses z and x as controls and when I type those in, a field opens in the bottom of the game window and displays the typed character, which interrupts the game. If I close that field, the keypress has worked.

Is there a way to make Firefox not open this field on a keypress?

Thanks very much - super newb question, but I appreciate the help.

Cheers

For anyone experiencing the same issues, I found a solve ( for me at least ).

Firefox - 'open menu' ( top right ), 'options', scroll way down to 'Browing' and unclick 'Search for text when you start typing' option.