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How do I increase the resolution of or zoom out the Firefox GUI in Windows?

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New Contributor

How do I increase the resolution of or zoom out the Firefox GUI in Windows?

The Firefox GUI is zoomed out/low resolution. This affects all parts of the browser (buttons, tabs, bars, etc.) and the web pages displayed.

I have tried running in Safe Mode and then reset Firefox; neither fixed the issue.

Note that my display settings are correct, as Firefox appears to be the only application affected.

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Site Moderator

Re: How do I increase the resolution of or zoom out the Firefox GUI in Windows?

Code changes regarding HiDPI have landed in Firefox 22 and later (bug #844604).

You can modify the layout.css.devPixelsPerPx and increase or decrease the value in 0.1 or 0.05 steps to adjust the size of fonts and other elements in Firefox.

  • The layout.css.devPixelsPerPx pref is a String value parsed to a float and allows to fine tune the dimensions of all elements (user interface and web pages) more precisely (resolution 0.1 or 0.05).
  • Change the default value -1 to 1 to make it work like in previous Firefox versions (100%)
  • Use values between 0.05 and 1.0 to reduce elements in size.
  • Use values greater than 1.0 to magnify and make elements larger (percentage divided by DPI, % / DPI).
  • http://kb.mozillazine.org/about:config

If web pages needs to be adjusted after changing this pref then you can look at the Default FullZoom Level or NoSquint extension.

Use this extension to adjust the font size for the user interface:

New Contributor

Re: How do I increase the resolution of or zoom out the Firefox GUI in Windows?

Thanks for the quick replies. Too bad Google doesn't have any of those near the top, as it appears to be a common issue.