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OS X how to change the bookmark toolbar size

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I want to change my bookmark toolbar size it is currently 3 times the size I want it to be with my new curved monitor. It is perfect if I switch back to a non curved monitor. But I don't want to run 2 - 27" monitors anymore and just want this 1 37" monitor but everything in Firefox is twice as big on this new monitor.

I want to change my bookmark toolbar size it is currently 3 times the size I want it to be with my new curved monitor. It is perfect if I switch back to a non curved monitor. But I don't want to run 2 - 27" monitors anymore and just want this 1 37" monitor but everything in Firefox is twice as big on this new monitor.
Attached screenshots

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You can set layout.css.devPixelsPerPx to 1.0 (default is -1) on the about:config page. Adjust its value in 0.1 or 0.05 steps (1.1 to enlarge or 0.9 to reduce) until icons or text looks right. Make sure not to use excessively large or small values

  • modifying layout.css.devPixelsPerPx affects user interface and webpages (global zoom)

You can open the about:config page via the location/address bar. You can click the button to "Accept the Risk and Continue".

Note that Firefox has a Zoom section in Options/Preferences to set the default zoom level for webpages.

  • Options/Preferences -> General -> Language and Appearance -> Zoom
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I assume you mean that the bar is a little bit taller on this monitor than on the other ones? I'm not sure why that would be the case. In your screenshot, it looks very similar in height to the main toolbar.

You could consider using custom style rules in a userChrome.css file to modify the height of the bar. This is not an officially supported solution, but many support volunteers could assist with that if you're interested.