Then specify the font size you want for proportional text. Select whether proportional text should be serif (like 'Times New Roman') or sans-serif (like 'Arial').For a language/script not in the list, choose Other Writing Systems.
Some websites have custom fonts to disable them: Any changes you've made will automatically be saved. Click the menu button and select Settings. Click the menu button and select Options Preferences. In the Menu bar at the top of the screen, click Firefox and select Preferences.