I'm the same. In the rare case I do have a lot of tabs open it tends to be a queue that I work through in order anyways so having them not fit on screen isn't a problem. My theory is that once I get over 20 tabs or so it will be quicker to just re-open the document (just type a few words in the URL bar and history-search will find it) than actually locate and click it. I'm glad that Firefox is flexible enough for tab hoarders and tab closers. Having a horizontal tab bar that doesn't take up too much space is perfect for me.