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

Posted

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.

Additional System Details

Installed Plug-ins

  • Next Generation Java Plug-in 10.25.2 for Mozilla browsers
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • Google Update
  • Shockwave Flash 11.7 r700
  • Adobe PDF Plug-In For Firefox and Netscape 10.1.7
  • VLC media player Web Plugin 2.0.6
  • Citrix Online App Detector Plugin
  • 5.1.20125.0
  • A plugin to detect whether the Adobe Application Manager is installed on this machine.
  • Office Authorization plug-in for NPAPI browsers

Application

  • Firefox 22.0
  • User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:22.0) Gecko/20100101 Firefox/22.0
  • Support URL: http://support.mozilla.org/1/firefox/22.0/WINNT/en-US/

Extensions

  • Troubleshooter 1.1a (troubleshooter@mozilla.org)

Javascript

  • incrementalGCEnabled: True

Graphics

  • adapterDescription: ATI Mobility Radeon HD 3670
  • adapterDescription2:
  • adapterDeviceID: 0x9593
  • adapterDeviceID2:
  • adapterDrivers: aticfx64 aticfx64 aticfx32 aticfx32 atiumd64 atidxx64 atiumdag atidxx32 atiumdva atiumd6a atitmm64
  • adapterDrivers2:
  • adapterRAM: 512
  • adapterRAM2:
  • adapterVendorID: 0x1002
  • adapterVendorID2:
  • direct2DEnabled: True
  • directWriteEnabled: True
  • directWriteVersion: 6.2.9200.16492
  • driverDate: 7-3-2012
  • driverDate2:
  • driverVersion: 8.970.100.3000
  • driverVersion2:
  • info: {u'AzureCanvasBackend': u'direct2d', u'AzureFallbackCanvasBackend': u'cairo', u'AzureContentBackend': u'direct2d'}
  • isGPU2Active: False
  • numAcceleratedWindows: 1
  • numTotalWindows: 1
  • webglRenderer: Google Inc. -- ANGLE (ATI Mobility Radeon HD 3670)
  • windowLayerManagerType: Direct3D 10

Modified Preferences

  • browser.cache.disk.capacity: 358400
  • browser.cache.disk.smart_size.first_run: False
  • browser.cache.disk.smart_size.use_old_max: False
  • browser.cache.disk.smart_size_cached_value: 358400
  • browser.places.smartBookmarksVersion: 4
  • browser.startup.homepage_override.buildID: 20130618035212
  • browser.startup.homepage_override.mstone: 22.0
  • dom.mozApps.used: True
  • extensions.lastAppVersion: 22.0
  • gfx.direct3d.last_used_feature_level_idx: 0
  • network.cookie.prefsMigrated: True
  • places.history.expiration.transient_current_max_pages: 104858
  • plugin.disable_full_page_plugin_for_types: application/pdf
  • plugin.importedState: True
  • privacy.sanitize.migrateFx3Prefs: True

Misc

  • User JS: No
  • Accessibility: No
cor-el
  • Top 10 Contributor
  • Moderator
10758 solutions 96832 answers

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:

Question owner

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.