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To zoom in on Firefox on my PC, I hold Ctrl and move the mouse wheel up. When I try to do this on my MacBook Pro, it zooms in everything, not just what's inside Firefox.

How can I use the zoom in Firefox on a MacBook Pro?

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up vote 1 down vote accepted

You can use your 2 finger for zooming Firefox inside.

Or use cmd + + for zooming in.

And cmd + - for zooming out.

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Moving the mouse wheel up and down while holding both Ctrl and Cmd keys will let you zoom in and out of the Firefox window, respectively.

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