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Scaling problem across two monitors.

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Trippy72
Trippy72
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I have 2 monitors - my laptop runs at 1600*900 on a small screen, but my secondary screen is a 32" with 4k resolution. The way I set up my laptop at home, both screens look good if they scale at 100%, so I've disabled Win 8.1 DPI scaling ("Let me chose one scaling level for all my displays").

Every program I run respects these settings except Firefox, which often still rescales to (horrible looking) "Extra Large" when moved onto the 4k screen. This doesn't always happen, but I can't figure out how to reproduce the problem - it seems to change on reboot, but once the computer starts up it will either insist on rescaling or not until my next session.

I've already tried setting layout.css.devPixelsPerPx to 1.0 (instead of -1.0), but it has no effect. I like Firefox but it looks so ugly (and takes up so much space on my big screen) I'm starting to avoid using it. Any ideas? Thanks...

I have 2 monitors - my laptop runs at 1600*900 on a small screen, but my secondary screen is a 32" with 4k resolution. The way I set up my laptop at home, both screens look good if they scale at 100%, so I've disabled Win 8.1 DPI scaling ("Let me chose one scaling level for all my displays"). Every program I run respects these settings except Firefox, which often still rescales to (horrible looking) "Extra Large" when moved onto the 4k screen. This doesn't always happen, but I can't figure out how to reproduce the problem - it seems to change on reboot, but once the computer starts up it will either insist on rescaling or not until my next session. I've already tried setting layout.css.devPixelsPerPx to 1.0 (instead of -1.0), but it has no effect. I like Firefox but it looks so ugly (and takes up so much space on my big screen) I'm starting to avoid using it. Any ideas? Thanks...

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cor-el
cor-el
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Did you try to modify the layout.css.devPixelsPerPx pref?

Note that you can also the Theme Font & Size Changer extension to set a zoom factor that modifies the layout.css.devPixelsPerPx pref.

You can set the layout.css.devPixelsPerPx pref on the about:config page to 1.0 You can adjust layout.css.devPixelsPerPx starting from 1.0 in 0.1 or 0.05 steps (1.1 or 0.9) to make icons show correctly.

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

You can look at the Default FullZoom Level or NoScript extension if web pages need to be adjusted after changing layout.css.devPixelsPerPx.