Latest Fire OS 8 user agents:

User Agent Browser Device
Mozilla/5.0 (Linux; Android 11; KFRAWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/148.4.3 like Chrome/148.0.7778.265 Safari/537.36 Mobile Silk 148 Fire HD 8 (2022)
Mozilla/5.0 (Linux; Android 11; KFQUWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/148.3.5 like Chrome/148.0.7778.258 Safari/537.36 Mobile Silk 148 Fire 7 (2022)
Mozilla/5.0 (Linux; Android 11; KFSNWI) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/148.0.7778.258 Safari/537.36 Chrome 148 Fire Max 11
Mozilla/5.0 (Linux; Android 11; AFTKRT) AppleWebKit/537.36 (KHTML, like Gecko) Silk/148.3.5 like Chrome/148.0.7778.258 Safari/537.36 Mobile Silk 148 Fire TV Stick 4K Max (2023)
Mozilla/5.0 (Linux; Android 11; KFTUWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/148.3.5 like Chrome/148.0.7778.258 Safari/537.36 Mobile Silk 148 Fire HD 10 (2023)
Mozilla/5.0 (Linux; Android 11; AFTBR92D74) AppleWebKit/537.36 (KHTML, like Gecko) Silk/148.3.5 like Chrome/148.0.7778.258 Safari/537.36 Mobile Silk 148 Unknown
Mozilla/5.0 (Linux; Android 11; KFRAPWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/148.3.5 like Chrome/148.0.7778.258 Safari/537.36 Mobile Silk 148 Fire HD 8 (2022)
Mozilla/5.0 (Linux; Android 11; KFSNWI Build/RS8338.3339N) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/146.0.7680.219 Safari/537.36 [FB_IAB/FB4A;FBAV/565.0.0.49.74;IABMV/1;] Facebook 565 Fire Max 11
Mozilla/5.0 (Linux; Android 11; KFRAPWI) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/148.0.7778.258 Safari/537.36 Chrome 148 Fire HD 8 (2022)
Mozilla/5.0 (Linux; Android 11; KFRAWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/148.3.5 like Chrome/148.0.7778.258 Safari/537.36 Mobile Silk 148 Fire HD 8 (2022)
Mozilla/5.0 (Fire OS 8) AppleWebKit/ (KHTML, like Gecko) Chrome/147 Safari/ Chrome 147 Unknown
Mozilla/5.0 (Linux; Android 11; AFTKRT) AppleWebKit/537.36 (KHTML, like Gecko) Silk/148.2.7 like Chrome/148.0.7778.178 Safari/537.36 Mobile Silk 148 Fire TV Stick 4K Max (2023)
Mozilla/5.0 (Linux; Android 11; KFRAPWI) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/148.0.7778.178 Safari/537.36 Chrome 148 Fire HD 8 (2022)
Mozilla/5.0 (Linux; Android 11; KFSNWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/148.2.1 like Chrome/148.0.7778.178 Safari/537.36 Mobile Silk 148 Fire Max 11
Mozilla/5.0 (Linux; Android 11; AFTT) AppleWebKit/537.36 (KHTML, like Gecko) Silk/148.2.7 like Chrome/148.0.7778.178 Safari/537.36 Mobile Silk 148 Fire TV Stick
Mozilla/5.0 (Linux; Android 11; AFTMA08C15 Build/RS8174.3641N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/146.0.7680.165 Mobile Safari/537.36 Chrome Webview 146 Unknown
Mozilla/5.0 (Linux; Android 11; AFTCIBFBD1 Build/RS8171.4055N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/144.0.7559.177 Mobile Safari/537.36 Chrome Webview 144 Unknown
Mozilla/5.0 (Linux; Android 11; AFTKRT Build/RS8174.3641N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/146.0.7680.165 Mobile Safari/537.36 Chrome Webview 146 Fire TV Stick 4K Max (2023)
Mozilla/5.0 (Linux; Android 11; KFRAPWI Build/RS8338.3339N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/146.0.7680.165 Safari/537.36 Chrome Webview 146 Fire HD 8 (2022)
Mozilla/5.0 (Linux; Android 11; AFTKM Build/RS8174.3641N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/146.0.7680.165 Mobile Safari/537.36 Chrome Webview 146 Fire TV Stick 4K (2023)