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To make the font bigger for tabs and bookmarks in Mozilla Firefox, you can use the built-in Zoom feature. When you are on the page you want to enlarge, press the "Ctrl" key and "+" key at the same time. However, this only affects the content within tabs. Unfortunately, Firefox does not offer a built-in feature to increase the size of font for the interface including tabs and bookmarks. You may have to adjust the display settings on your computer for a larger overall scale. Please remember that this will impact all applications on your computer, not just Firefox.