If you use your bookmarks bar to store lots of websites for easy access, you’ll soon run out of space on the toolbar. You can add folder to the bar to organise your bookmarks. But there is another option that you could try and see if it suits you.
Right-click on a bookmark and select Edit. Clear the name of the site (but not the URL) and click Save. This will remove all the text from the bookmark, leaving just the favicon, which lets your fit more sites on the bar. Hovering your mouse over the icon will show the site address.