Latest Fire OS 8 user agents:

User Agent Browser Device
Mozilla/5.0 (Linux; Android 11; KFQUWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/146.4.10 like Chrome/146.0.7680.224 Safari/537.36 Mobile Silk 146 Fire 7 (2022)
Mozilla/5.0 (Linux; Android 11; KFRAWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/148.2.1 like Chrome/148.0.7778.178 Safari/537.36 Mobile Silk 148 Fire HD 8 (2022)
Mozilla/5.0 (Linux; Android 11; KFTUWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/148.2.1 like Chrome/148.0.7778.178 Safari/537.36 Mobile Silk 148 Fire HD 10 (2023)
Mozilla/5.0 (Linux; Andr0id 11; AFTMA475B1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.7559.110 Safari/537.36 OMI/4.27.0.9.AFTdev.1045 HbbTV/1.7.1 ( DRM;Amazon;AFTMA475B1-TCL-50T6C;0031340936324;unknown;com.amazon.MT9026;) smarttv_AFTMA475B1-TCL-50T6C_Build_0031340936324_Chromium_144.0.7559.110 Opera Devices 4 50T6C
Mozilla/5.0 (Linux; Android 11; AFTT) AppleWebKit/537.36 (KHTML, like Gecko) Silk/146.4.10 like Chrome/146.0.7680.224 Safari/537.36 Mobile Silk 146 Fire TV Stick
Mozilla/5.0 (Linux; Android 11; KFTUWI 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 10 (2023)
Hulu/1.180.0 (Fire OS 8.1.6.6 (RS8166/3482); ; AFTKM; Build/Neutron - 1.4.596) Hulu 1 Fire TV Stick 4K (2023)
Mozilla/5.0 (Linux; Android 11; KFTUWI Build/RS8338.3339N) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/146.0.7680.165 Safari/537.36 [FB_IAB/FB4A;FBAV/562.0.0.51.73;IABMV/1;] Facebook 562 Fire HD 10 (2023)
Mozilla/5.0 (Linux; Android 11; KFRAWI Build/RS8333.2734N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.6723.170 Mobile Safari/537.36 Chrome Mobile 130 Fire HD 8 (2022)
Mozilla/5.0 (Linux; Android 11; KFRAWI Build/RS8333.2734N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.6723.170 Mobile Safari/537.36 EduBrowser/1.0 EduZid Chrome Mobile 130 Fire HD 8 (2022)
Mozilla/5.0 (Linux; Android 11; AFTHY7ABBA Build/RS8169.3556N; 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; KFSNWI) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.7680.224 Safari/537.36 Chrome 146 Fire Max 11
Mozilla/5.0 (Linux; Android 11; KFRAWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/146.4.10 like Chrome/146.0.7680.224 Safari/537.36 Mobile Silk 146 Fire HD 8 (2022)
Mozilla/5.0 (Linux; Android 11; KFSNWI 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 Max 11
Mozilla/5.0 (Fire OS 8; rv:147.0) Gecko/20100101 Firefox/147.0 Firefox 147 Unknown
Mozilla/5.0 (Linux; Android 11; AFTKRT) AppleWebKit/537.36 (KHTML, like Gecko) Silk/146.4.10 like Chrome/146.0.7680.224 Safari/537.36 Mobile Silk 146 Fire TV Stick 4K Max (2023)
Mozilla/5.0 (Linux; Android 11; KFTUWI Build/RS8338.3339N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/146.0.7680.165 Mobile Safari/537.36 [Pinterest/Android] Pinterest Fire HD 10 (2023)
Mozilla/5.0 (Linux; Android 11; KFRAWI) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.7680.224 Safari/537.36 Chrome 146 Fire HD 8 (2022)
Mozilla/5.0 (Linux; Android 11; AFTKM Build/RS8169.3556N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/144.0.7559.177 Mobile Safari/537.36 Chrome Webview 144 Fire TV Stick 4K (2023)
Mozilla/5.0 (Linux; Android 11; KFRAPWI Build/RS8338.3339N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/144.0.7559.237 Safari/537.36 Chrome Webview 144 Fire HD 8 (2022)