Google Chrome is too dominating, this is not good for the web. So I'm switching back to Firefox, but it can be pretty ugly by default in places.
I like to apply the following tweaks to make it pretty again:
Increase the Address Bar font size
Edit userChrome.css to make style changes to the Firefox UI. My Profile is located at %appdata%\Mozilla\Firefox\Profiles\<Gibberish>, use the previous link to find the location on your system. Inside your profile create a chrome folder and inside that create a userChrome.css. Add the following line:
#urlbar { font-size: 13px; }
The possibilities are endless but this does the trick for me. Restart Firefox after saving the file.
Remove unwanted buttons and the searchbox
Right click on any of the toolbar buttons > Customize... to bring up the Customize Firefox screen. Remove unused buttons and the search box (search via the address bar instead) by dragging them to the Additional Tools and Features panel -- or the hamburger menu panel to access them with a click.
Make the tabs square again
Firefox tabs have this rounded look to them, which I find displeasing: install the Squared Australis Tabs addon to add square corners instead.
Hide the menu bar
Did you know you can access the menu bar by pressing the Alt key on your keyboard? The menu bar is visible by default but it is not frequently accessed, so press Alt+V or bring up the View menu bar menu and untick the Menu Bar and optionally the Bookmark Toolbar items.
Hide bookmark toolbar item names
You can blank out the Name of a bookmark to have it display just the icon in the toolbar, which tidies up those frequently accessed sites.