When scrolling down the mouse wheel with CTRL, the zoom decreases. I would like it to increase when I scroll down, and vice versa.

Is there a way to change it?

1 Answer 1


Open about:config and set the preference:

For Firefox 17+:

mousewheel.with_control.delta_multiplier_y = -100 // default 100

For Firefox <=16:

mousewheel.withcontrolkey.numlines = -1 // default 1

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