Make Firefox Smaller / Zoom Out / More Compact

If you use Firefox and can not find that perfect compact theme, fear not, we can easily just change the size of everything!

In address bar go to about:config. Search in there for the setting layout.css.devPixelsPerPx. For default size set it to -1.0 or 1.0. I usually set mine around 0.9 to 0.95 for slightly better use of screen real estate.

I may make a simple Firefox addon later at some point to make this feature more accessible.