Latest Fire OS user agents:

User Agent Browser Device
Mozilla/5.0 (Linux; Android 11; KFRAWI Build/RS8338.3339N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/144.0.7559.237 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/556.0.0.60.64;IABMV/1;] Facebook 556 Fire HD 8 (2022)
Mozilla/5.0 (Linux; Android 11; KFQUWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/144.3.1 like Chrome/144.0.7559.228 Safari/537.36 Mobile Silk 144 Fire 7 (2022)
Mozilla/5.0 (Linux; Android 11; KFRASWI) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.7680.165 Safari/537.36 Chrome 146 Unknown
Mozilla/5.0 (Linux; Android 11; KFRAWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/146.2.1 like Chrome/146.0.7680.165 Safari/537.36 Mobile Silk 146 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/144.0.7559.237 Safari/537.36 [FB_IAB/FB4A;FBAV/555.0.0.49.59;IABMV/1;] Facebook 555 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/144.0.7559.237 Safari/537.36 [Pinterest/Android] Pinterest Fire HD 8 (2022)
Mozilla/5.0 (Linux; Android 11; KFTUWI Build/RS8338.3339N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/144.0.7559.237 Safari/537.36 [FB_IAB/FB4A;FBAV/556.0.0.60.64;IABMV/1;] Facebook 556 Fire HD 10 (2023)
Mozilla/5.0 (Linux; Android 11; KFTUWI Build/RS8338.3339N) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/144.0.7559.237 Safari/537.36 [FB_IAB/FB4A;FBAV/555.0.0.49.59;IABMV/1;] Facebook 555 Fire HD 10 (2023)
Mozilla/5.0 (Linux; Android 11; KFRAPWI) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.7444.251 Safari/537.36 Chrome 142 Fire HD 8 (2022)
Mozilla/5.0 (Linux; Android 11; KFRASWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/146.2.1 like Chrome/146.0.7680.165 Safari/537.36 Mobile Silk 146 Unknown