[Bug 1455286] Re: Firefox appears horribly distorted after upgrade to 38.0

[Pacific Seascape]

This is a ZaReason Verix 2.5 notebook, designed for use with Ubuntu (and
Kubuntu). However, it is typically used like a desktop, connected to
peripherals including a large display and keyboard/mouse.

Setting layout.css.devPixelsPerPx to 1.0 does reset the Firefox user
interface back to what it is supposed to be. I'll be able to stay on the
latest version (39.x) now.

But I'm mystified: Firefox has been set to use the system default for a
long time... since Trusty was installed on this system, actually. Prior
to version 38, -1 had the same effect as the 1.0 setting you suggested.

But as of version 38, -1 suddenly became equivalent to something higher
-- maybe 1.5. What's up with that?

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Title:
  Firefox appears horribly distorted after upgrade to 38.0

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