I found the address bar & search bar font size to be really small. Mozilla should have given an option to fix this in the about:config but it hasn't. The other add-on made font size ridiculously big. This one worked perfectly on the new 64-bit version of FF! Thank you, Dev.
This is still one of my favourite addons. I only use it now to increase the font size because the "Set padding for navigation toolbar buttons" feature that I liked doesn't work anymore with Australis nor Classic Theme Restorer.
Excellent for increased readability. Also handy when used as part of a less-screen-real-estate Firefox UI.Works with tab mix plus, colorful tabs, search bar autosizer (don't set both to autosize), hide caption-titlebar plus, roomy bookmarks toolbar and probably a few others I can't remember. 5 Stars for being A: simple, (only 11.8kB). B: very usable. Also don't miss author's cleanest add-ons manager, also excellent.
Wold be good to trim the url in Firefox urlbar (when too long) showing the beginning and the end of the url. That because those are the more important parts of a url for watch. And if possible highlight them changing font color.
This add-on and "Prevent Tab Overflow" (I preferred "NOverflow," myself) add functionality so universally superior, that they should be incorporated directly into the Firefox code. I am very much a fan of many of your userstyles. Phenomenal work.