Download and test the latest { -brand-name-firefox } for desktop features with { -brand-name-developer-edition }, { -brand-name-beta } and { -brand-name-nightly } builds.
下载和测试 { -brand-name-firefox } 桌面版在 { -brand-name-developer-edition }、{ -brand-name-beta } 版和 { -brand-name-nightly } 版中的新功能。