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Firefox zoom reset at 125%

My new laptop has a 17″ full HD screen and I noticed that in Firefox websites would appear larger than they’re actually are. At first I thought I had accidentally zoomed in a bit but Firefox reported it was at 100%. The cause of this behavior is because Firefox looks at the pixel density of your screen and bases its optimal default zoom level on that.

If you want 100% zoom to be really 100% zoom just browse to about:config and search for layout.css.devPixelsPerPx and change its value to 1.0.

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