Is only the Bookmarks Manager (Library) window affected?

Can you attach a screenshot?

• https://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem
• use a compressed image type like PNG or JPG to save the screenshot

I have the same issue - see screenshot here. The "Manage Bookmarks" pop out window has small font, compared to the other menus around. I'm also on a Macbook and would like to make the font on my Bookmarks Toolbar larger as well, but cannot see where to do so.