i dislike horizontal tabs, so i go with sidebery / tree-style-tabs. also use a lot of pinned tabs and they sit on top of the list of tabs. this way i can have ~10 pinned tabs and still remember what all of these are.
"The browser chrome" is the name historically given to the parts of the browser that are not the website. Then Google created a web browser and decided to name it after it - but userChrome.css existed before the browser Chrome did :)