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Don’t Size

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  • Last reply by cor-el

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I need the browser text to be larger both on Firefox homepage as well as on websites my search brings up. iPhone has controls that work on it’s own sites and also many sites I click on. Does Firefox have anything similar?

As another example, the text I’m typing here is barely legible for me.

I’m not blind or near-blind. I’m just an average middle-aged person, who started having eyesight problems magically appear at 40.

I need the browser text to be larger both on Firefox homepage as well as on websites my search brings up. iPhone has controls that work on it’s own sites and also many sites I click on. Does Firefox have anything similar? As another example, the text I’m typing here is barely legible for me. I’m not blind or near-blind. I’m just an average middle-aged person, who started having eyesight problems magically appear at 40.

Chosen solution

You can set layout.css.devPixelsPerPx to 1.0 (default is -1) on the about:config page. Adjust its value in 0.1 or 0.05 steps (1.1 or 0.9) until icons or text looks right.

  • modifying layout.css.devPixelsPerPx affects user interface and web pages (global zoom)

You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.


Firefox has a Zoom section in Options/Preferences to set the default zoom level for web pages in case you need to compensate changes made by layout.css.devPixelsPerPx.

  • Options/Preferences -> General -> Language and Appearance -> Zoom
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Chosen Solution

You can set layout.css.devPixelsPerPx to 1.0 (default is -1) on the about:config page. Adjust its value in 0.1 or 0.05 steps (1.1 or 0.9) until icons or text looks right.

  • modifying layout.css.devPixelsPerPx affects user interface and web pages (global zoom)

You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.


Firefox has a Zoom section in Options/Preferences to set the default zoom level for web pages in case you need to compensate changes made by layout.css.devPixelsPerPx.

  • Options/Preferences -> General -> Language and Appearance -> Zoom