Latest Amazon Kindle Fire HD 8.9" WiFi user agents:

User Agent	Browser	Platform
Mozilla/5.0 (Linux; U; Android 6.0.4; en-us; KFJWI Build/IMM76D) AppleWebKit/537.36 (KHTML, like Gecko) Silk/3.68 like Chrome/39.0.2171.93 Safari/537.36	Mobile Silk 3	Fire OS
Mozilla/5.0 (Linux; Android 7.1.2; Amazon Jem Build/NJH47F) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.6045.193 Safari/537.36	Chrome 119	Android 7
Mozilla/5.0 (Linux; U; en-us; KFJWI Build/IMM76D) AppleWebKit/535.19 (KHTML, like Gecko) Silk/3.17 Safari/535.19 Silk-Accelerated=true	Mobile Silk 3	Fire OS
Mozilla/5.0 (Linux; U; Android 4.0.4; en-ca; KFJWI Build/IMM76D) AppleWebKit/537.36 (KHTML, like Gecko) Silk/3.68 like Chrome/39.0.2171.93 Safari/537.36	Mobile Silk 3	Fire OS 3
Mozilla/5.0 (Linux; U; Android 4.0.4; en-us; KFJWI Build/IMM76D) AppleWebKit/537.36 (KHTML, like Gecko) Silk/3.68 like Chrome/39.0.2171.93 Safari/537.36	Mobile Silk 3	Fire OS 3
Mozilla/5.0 (Linux; U; Android 4.0.4; en-us; KFJWI Build/IMM76D) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Safari/534.30 [Pinterest/Android]	Pinterest	Fire OS 3
Mozilla/5.0 (Linux; U; en-us; KFJWI Build/IMM76D) AppleWebKit/535.19 (KHTML, like Gecko) Silk/3.17 Safari/535.19 Silk-Accelerated=false	Mobile Silk 3	Fire OS
Mozilla/5.0 (Linux; Android 4.0.4; KFJWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/73.7.5 like Chrome/73.0.3683.90 Safari/537.36	Mobile Silk 73	Fire OS 3