dpi

On a few of my computers with 4K monitors running Linux, Firefox either display with tiny fonts or very large fonts, while most applications behave normally. After searching for a work around, I found the following solution works for me: setting the layout.css.devPixelsPerPx to a smaller number, e.g. 0.7. From this this page: You can set layout.css.devPixelsPerPx to 1.0 (default is -1) on the about:config page. Adjust its value in 0....