When Firefox goes to a new webpage I don't want it at 100% zoom but at a different percentage that I specify, and I want it to always use this zoom for all pages that it goes to. How can I do that?

3 Answers 3


The Firefox addon NoSquint allows you to adjust the text-only and full-page (both text and images) zoom levels as well as color settings both globally (for all sites) and per site.

  • This is useful.
    – Phenom
    Dec 30, 2009 at 16:25
  • It's not only useful, it's the best add-on I've ever used. My tired old eyes are thankful for the SuperUser for told me about it.
    – Patriot
    Dec 30, 2009 at 16:30
  • I don't see it for Firefox Quantum. Is there another approach to fix the zoom level for all websites? Dec 27, 2017 at 20:48
  • this plugin is no longer maintained
    – lofidevops
    Mar 27, 2018 at 14:04

This is user configurable from Firefox, without the need for any add-ons.

  1. In the address line, type: about:config

  2. Scroll down or search for the preference name: browser.zoom.siteSpecific

  3. Double-click to change the value to false

Now your zoom settings will carry over from site to site.

  • 1
    Does changing browser.zoom.siteSpecific take effect immediately or is a restart of Firefox necessary? Ref Feb 15, 2012 at 9:55
  • 2
    This does not work with Firefox 29
    – Zombo
    May 4, 2014 at 7:59
  • 1
    this works in v32: type about:config in address bar, search for layout.css.devPixelsPerPx, change value from -1.0 (auto equals win dpi) to for example 1.5 (equals 150%)
    – user372675
    Sep 26, 2014 at 18:17
  • devPixelsPerPx scale the whole UI, not only web content. But it's probably the closest addon-less workaround. Jan 4, 2016 at 15:44

The default zoom in Firefox can be reset to any value for all webpages without installing an extension.

  1. In the Firefox address bar type: about:config

  2. Search for this preference: layout.css.devPixelsPerPx

  3. Replace the default value of -1.0 with the new percentage zoom. For example, if you want to change the default zoom from the default value of 100% to 125%, then change the value of layout.css.devPixelsPerPx to 1.25

If you are also using Chrome web browser then the default zoom level can be easily changed from the settings ( 3 vertical dots icon ) in the upper right corner of Chrome. For a better browsing experience set the same default zoom for both Firefox and Chrome.

This was tested on the latest version of Firefox 57 (a.k.a. Firefox Quantum) and Chrome 62, and it also works on Firefox 52 Extended Support Release (ESR).

  • This was tested on the latest version of Firefox 57 (a.k.a. Firefox Quantum) and Chrome 62.
    – karel
    Nov 17, 2017 at 7:04
  • 1
    also works in pre-quantum ESR (Firefox 52)
    – lofidevops
    Mar 27, 2018 at 14:05

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