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.


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.

  • 1
    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
  • That doesn't seem to work anymore in FF 51+ what gives? – Grumpy ol' Bear Nov 27 '16 at 7:38
  • I don't have enough points to comment on Bhargav Bhat answer, but it seems that the toolkit.zoomManager.zoomValues as not effect when you use <kbd>CTRL</kbd> + <kbd>Mousewheel</kbd>. But it is taken into account when you zoom: - Using <kbd>CTRL</kbd> + <kbd>-</kbd> or <kbd>CTRL</kbd> + <kbd>+</kbd> - Using the Zoom feature in the Hamburger menu. – Nis Jul 3 at 11:45

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