You can find the eyedropper under “Browser Tools” in the Tools menu or under “More Tools” in the { -brand-name-firefox } toolbar menu (at the end of the { -brand-name-firefox } toolbar).
您可以在“工具”菜单的“浏览器工具”中，或是 { -brand-name-firefox } 工具栏菜单底部的“更多工具”中找到取色器。