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How do I change the zoom increment that is used by Firefox whenever I zoom-in or zoom-out of webpages?

I find that the default zoom increment is a bit too big for my taste.

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1 Answer 1

up vote 5 down vote accepted

You can do this as follows (I tried it with Firefox 10.0.2 here):

  • Type about:config in the address bar
  • Filter for toolkit.zoomManager.zoomValues

This will show you the various zoom "steps" the browser has. The steps are specified as decimal numbers (representing precentages of the original, so .3 means 30% of original), separated by a ,. See Tweak Firefox 3 full page zoom for the details.

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This works, but Firefox must be restarted before it takes effect (at least in the most recent version of Firefox, 34). For instance, opening a new tab is not enough. –  Peter Mortensen Dec 7 '14 at 19:24
Restarting Firefox required: similar to Super User question How to permanently zoom in Firefox without using addons?. –  Peter Mortensen Dec 7 '14 at 19:31

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