It's an underdog, but could well be the best REST client for Firefox since the latest update to RESTED broke everything. Simple, clean, easy to use.
(Honestly, the collapsible-JSON-viewer alone was enough for me to choose this over other alternatives out there- love it)

很好的扩展，Body那里的复制按钮点击后出现的弹窗里的Format和Raw点击没反应，希望优化下~