Latest Amazon Fire HD 8 (2020) user agents:

User Agent	Browser	Platform
Mozilla/5.0 (Linux; Android 9; KFONWI Build/PS7331.4463N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.244 Safari/537.36 [FB_IAB/FB4A;FBAV/510.0.0.72.41;IABMV/1;]	Facebook 510	Fire OS 7
Mozilla/5.0 (Linux; Android 9; KFONWI Build/PS7331.4463N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.244 Safari/537.36 [FB_IAB/FB4A;FBAV/443.0.0.23.229;]	Facebook 443	Fire OS 7
Mozilla/5.0 (Linux; Android 9; KFONWI Build/PS7331.4463N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.244 Safari/537.36 [FB_IAB/FB4A;FBAV/552.1.0.45.68;IABMV/1;]	Facebook 552	Fire OS 7
Mozilla/5.0 (Linux; Android 9; KFONWI Build/PS7331.4463N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.244 Safari/537.36[FBAN/EMA;FBLC/en_US;FBAV/502.0.0.5.105;FBCX/modulariab;]	Facebook Lite 502	Fire OS 7
Mozilla/5.0 (Linux; Android 9; KFONWI Build/PS7331.4463N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.244 Safari/537.36 [FB_IAB/FB4A;FBAV/460.0.0.34.89;]	Facebook 460	Fire OS 7
Mozilla/5.0 (Linux; Android 9; KFONWI Build/PS7331.4463N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.244 Safari/537.36 [FB_IAB/FB4A;FBAV/548.1.0.51.64;IABMV/1;]	Facebook 548	Fire OS 7
Mozilla/5.0 (Linux; Android 9; KFONWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/138.12.1 like Chrome/138.0.7204.244 Safari/537.36	Mobile Silk 138	Fire OS 7
Mozilla/5.0 (Linux; Android 9; KFONWI Build/PS7331.4463N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.244 Safari/537.36 [FB_IAB/FB4A;FBAV/526.1.0.66.75;IABMV/1;]	Facebook 526	Fire OS 7
Mozilla/5.0 (Linux; Android 9; KFONWI Build/PS7331.4463N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.244 Safari/537.36 [FB_IAB/FB4A;FBAV/445.0.0.34.118;]	Facebook 445	Fire OS 7
Mozilla/5.0 (Linux; Android 9; KFONWI Build/PS7331.4463N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.244 Safari/537.36 [FB_IAB/FB4A;FBAV/452.0.0.45.110;]	Facebook 452	Fire OS 7
Mozilla/5.0 (Linux; Android 9; KFONWI Build/PS7331.4463N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.244 Safari/537.36 [FB_IAB/FB4A;FBAV/545.0.0.43.63;IABMV/1;]	Facebook 545	Fire OS 7
Mozilla/5.0 (Linux; Android 9; KFONWI Build/PS7331.4463N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.244 Safari/537.36 [FB_IAB/FB4A;FBAV/549.0.0.61.62;IABMV/1;]	Facebook 549	Fire OS 7
Mozilla/5.0 (Linux; Android 9; KFONWI Build/PS7331.4463N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.244 Safari/537.36[FBAN/EMA;FBLC/en_US;FBAV/501.0.0.12.103;FBCX/modulariab;]	Facebook Lite 501	Fire OS 7
Mozilla/5.0 (Linux; Android 9; KFONWI Build/PS7331.4463N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.244 Safari/537.36 [FB_IAB/FB4A;FBAV/551.1.0.58.63;IABMV/1;]	Facebook 551	Fire OS 7
Mozilla/5.0 (Linux; U; Android 9; KFONWI Build/PS7329.3851N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/124.0.6367.248 Safari/537.36 OPR/19.0.2254.108926	Opera 19	Fire OS 7
Mozilla/5.0 (Linux; U; Android 9; KFONWI Build/PS7327.3329N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/112.0.5615.197 Safari/537.36 OPR/72.0.2254.67128	Opera 72	Fire OS 7
Mozilla/5.0 (Linux; U; Android 9; KFONWI Build/PS7327.3329N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/112.0.5615.197 Safari/537.36 OPR/59.0.2254.59153	Opera 59	Fire OS 7
Mozilla/5.0 (Linux; U; Android 9; es-es; KFONWI Build/PS7331.4463N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.7204.224 Mobile Safari/537.36 PHX/19.5	Phoenix Browser 19	Fire OS 7
Mozilla/5.0 (Linux; Android 9; KFONWI; Flow) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/338.0.0.248 Safari/537.36	Flow Browser	Fire OS 7
Mozilla/5.0 (Linux; Android 9; KFONWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/98.6.10 like Chrome/98.0.4758.136 Safari/537.36	Mobile Silk 98	Fire OS 7