Firefox zoom 100% not equal to screen size - firefox

My desktop screen resolution is 1080x1920 (the monitor is using portrait orientation). I noticed a website I'm working on is showing up in tablet mode in FireFox (Chrome and IE work fine). The media query for tablet styling is
#media only screen and (max-width: 959px) { ... }
So even with some loss for window borders and scroll bars I should have plenty of width for the full desktop site. I checked screen.width and it is returning 864. I noticed this is the width IE and Chrome report when zoomed to 125%, but firefox is zoom is at 100%. Is there some setting I'm missing in FF or do I just have to set my default zoom to 80%?

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Something that may be relevant that I've come across -
Requesting { width: 640, height: 480 } on iOS in portrait mode will return a camera MediaStream which is { width: 480, height: 640 }, and on orientation change the MediaStream flips its dimensions. Be careful around hardcoding the html elements width and height. Can cause warping. People should stick to known resolutions e.g those listed in en.wikipedia.org/wiki/Display_resolution. When you use an atypical resolution WebRTC spec states the browser will try emulate your desired feed. However this makes poor cross-browser code. If you want a consistent camera feed I would avoid this.
source:
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Just tested myself, the problem is the font-size setting in my Windows OS:
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http://www.jsfiddle.net/PUMqS/
The facebook icon is vertically centered on Opera / Chrome, but not in Firefox / IE.
Do you know why, and how I could resolve this issue?
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But note that whether it is or not depends on your exact fonts and how they get rasterized. If you're on Windows, Firefox and IE are both using DirectWrite for text while Opera and Chrome are using GDI. You could try turning off hardware acceleration in Firefox to make it use GDI and see if that changes the rendering for you. If it does, then you need to fix the markup to not depend on the text metrics for the centering...

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