Originally Posted By: tfabris
View, Zoom, Zoom In
View, Zoom, Zoom Out

Ctrl +
Ctrl -

Ctrl Mouswheel up and down.

I'm a particular fan of Zoom Toolbar for Firefox, which gives me a really nice "=" button to set the zoom back to normal size after I'm done zooming with the mousewheel.

And lastly, Ctrl+0 (that's zero) to go back to 100%.
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Matt