Just upgraded to TB 115 on Mac. I've always thought that the default font for the TB system, used in the subject lime window and left bar (as opposed to the font for composing messages) was too small, and there never seemed to be a way of making it larger. With the upgrade to 115, it got even smaller! The knowledge base suggested to use the Config Editor to modify the variable layout.css.devPixelsPerPx (normally set to -1) to 1.4. This resulted it a nice display on my big monitor, but dragging the window to my laptop screen resulted in an extremely tiny font! I need a reliable way to do this. Otherwise, I'll have to revert versions, or at worst, give up on T'bird, which I don't want to do.