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Firefox is no longer supported on Windows 8.1 and below. Please download Firefox ESR (Extended Support Release) to use Firefox.
Firefox をカスタマイズしてみよう
Note: There are other ways to customize Firefox. For example, you can add features to Firefox with add-ons and you can customize the New Tab page. Firefox's toolbar provides easy access to common features. Do you miss something you use a lot? The toolbar is easy to customize. Is there something you don't use all the time? Try adding it to the overflow menu. We'll show you how. Customize the overfl
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