Firefox zoomed in about 150%, Site and Browser itself

It seems as if the resolution of the entire browser got lowered.
All sites appear to be 150% zoomed, and all the buttons and toolbars also are enlarged.
I tried:
- Ctrl+0 to reset a page; Doesn't do anything, unless I manually zoom out, then Ctrl+0 zooms back to 150%
- Defaulting 'all' zoom values in about:config (including turning off site specific zooming): no result
- Starting in Safemode; no results
- Uninstalling, deleting all data and reinstalling; no result.
I don't remember a specific action that might have caused this (Didn't install any new addons, change any settings etc.)

Code changes regarding HiDPI support for high resolution displays have landed in Firefox 22 and later (bug #844604).
You can set the layout.css.devPixelsPerPx pref on the <b>about:config</b> page to 1.0 (current default value is -1.0) to restore the behavior of previous Firefox versions.
*http://kb.mozillazine.org/about:config
Use this extension to adjust the font size for the user interface.
*Theme Font & Size Changer: https://addons.mozilla.org/firefox/addon/theme-font-size-changer/
You can look at the Default FullZoom Level or NoScript extension if web pages need to be adjusted after changing the layout.css.devPixelsPerPx pref.
*Default FullZoom Level: https://addons.mozilla.org/firefox/addon/default-fullzoom-level/
*NoSquint: https://addons.mozilla.org/firefox/addon/nosquint/
*https://support.mozilla.org/kb/forum-response-Zoom-feature-on-Firefox-22

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Say thanks by clicking the Kudos thumb up in the post.
If my post resolve your problem please mark it as an Accepted Solution

Firefox zoomed in about 150%, Site and Browser itself

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