Latest Fire OS user agents:

User Agent Browser Device
Mozilla/5.0 (Linux; Android 11; KFRASWI Build/RS8338.3339N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/142.0.7444.236 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/544.0.0.42.272;IABMV/1;] Facebook 544 Unknown
Mozilla/5.0 (Linux; Andr0id 11; AFTSH3F7EF) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.7390.108 Safari/537.36 OMI/4.26.2.309.AFTdev.1026 HbbTV/1.7.1 (+DRM;Amazon;AFTSH3F7EF-Panasonic-TV-65W83AE6;0030501842052;unknown;com.amazon.MT9026;) smarttv_AFTSH3F7EF-Panasonic-TV-65W83AE6_Build_0030501842052_Chromium_141.0.7390.108 Opera Devices 4 Unknown
Mozilla/5.0 (Linux; Android 11; KFRAWI Build/RS8338.3339N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/142.0.7444.236 Safari/537.36 [FB_IAB/FB4A;FBAV/524.0.0.52.44;IABMV/1;] Facebook 524 Fire HD 8 (2022)
Mozilla/5.0 (Linux; Andr0id 11; AFTSH3F7EF-AFTBR92D74-Freely-4DD-2CC-001) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.7444.176 Safari/537.36 OMI/4.26.2.344.AFTdev.1028 HbbTV/1.7.1 (+DRM;Amazon;AFTSH3F7EF-AFTBR92D74-Freely-4DD-2CC-001;0030736750980;unknown;com.amazon.MT9026;) FVC/9.0 (Amazon;com.amazon.MT9026;) smarttv_AFTSH3F7EF-AFTBR92D74-Freely-4DD-2CC-001_Build_0030736750980_Chromium_142.0.7444.176 Opera Devices 4 Unknown
Mozilla/5.0 (Linux; Android 11; KFQUWI Build/RS8338.3339N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/142.0.7444.236 Safari/537.36 [FB_IAB/FB4A;FBAV/547.0.0.41.68;IABMV/1;] Facebook 547 Fire 7 (2022)
Mozilla/5.0 (Linux; Android 11; KFRAPWI Build/RS8338.3339N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/145.0.7632.52 Safari/537.36 [FB_IAB/FB4A;FBAV/548.1.0.51.64;IABMV/1;] Facebook 548 Fire HD 8 (2022)
Mozilla/5.0 (Linux; Android 11; KFRAWI Build/RS8338.3339N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/142.0.7444.236 Safari/537.36 [FB_IAB/FB4A;FBAV/548.1.0.51.64;IABMV/1;] Facebook 548 Fire HD 8 (2022)
Mozilla/5.0 (Linux; Android 11; KFQUWI) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.7559.228 Safari/537.36 Chrome 144 Fire 7 (2022)
Mozilla/5.0 (Linux; Android 11; AFTKRT) AppleWebKit/537.36 (KHTML, like Gecko) Silk/144.2.5 like Chrome/144.0.7559.177 Safari/537.36 Mobile Silk 144 Fire TV Stick 4K Max (2023)
Mozilla/5.0 (Linux; Android 11; KFRASWI Build/RS8338.3339N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/142.0.7444.236 Safari/537.36 [FB_IAB/FB4A;FBAV/551.1.0.58.63;IABMV/1;] Facebook 551 Unknown