For more information, please visit the following pages:

• Firefox
• Mozilla Foundation
• Gecko

Latest user agents (if you are looking for complete list, download it here):

• Mozilla/5.0 (Mobile; Sachet_Wave_Z1; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.2
• Mozilla/5.0 (Mobile; Y9_TZ1_4G; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.2
• Mozilla/5.0 (Mobile; ALCATEL 4052Z; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.2 [ip:168.243.181.185]
• Mozilla/5.0 (Mobile; Nokia 6300 4G; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.4 [ip:2.196.18.116]
• Mozilla/5.0 (Mobile; LOGIC_B8K_3G; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1.2
• Mozilla/5.0 (Mobile; SPC_F15SE_4G; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.2
• Mozilla/5.0 (Mobile; Fise_32433_3G; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1.2
• Mozilla/5.0 (Mobile; Positivo_P70S_4G; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1.1
• Mozilla/5.0 (Android 6.0.1; Mobile; rv:48.0) Gecko/48.0 Firefox/48.0 [ip:134.209.137.157]
• Mozilla/5.0 (Mobile; ENERGIZER_H280A_512; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1.1
• Mozilla/5.0 (Mobile; LOGAN_Panita_3G; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1.2
• Mozilla/5.0 (Mobile; smart2.4S; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1.1
• Mozilla/5.0 (Mobile; Unitel_M42445_4G; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.2
• Mozilla/5.0 (Mobile; Digit_Digit4G-Defender_4G; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.2
• Mozilla/5.0 (Mobile; CKT_U102AC; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.1
• Mozilla/5.0 (Mobile; Crosscall_Core-S4_4G; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.2
• Mozilla/5.0 (Mobile; Nokia 8000 4G; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.4.1
• Mozilla/5.0 (Mobile; GIGASET_GL7_4G; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.2
• Mozilla/5.0 (Mobile; Energizer_E242S_4G; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.2
• Mozilla/5.0 (Mobile; ALCATEL 4052R; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.2
• Mozilla/5.0 (Mobile; BLU_TankMega_3G; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1.1
• Mozilla/5.0 (Mobile; Multilaser_ZAPP; rv:48.0; K-Lite) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1.1
• Mozilla/5.0 (Mobile; Nokia_2720_Flip; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.2.2
• Mozilla/5.0 (Mobile; Logicom_Kay_243_3G; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1.2
• Mozilla/5.0 (Mobile; VGO_TEL_Smart_Hi-Fi_3G; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1.2
• Mozilla/5.0 (Mobile; PLUM_E900_3G; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1.2
• Mozilla/5.0 (Mobile; ACCENT_NUBIA60K; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1.1
• Mozilla/5.0 (Mobile; Maxcom_MK399_4G; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1.2
• Mozilla/5.0 (Mobile; Nokia 6300 4G; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.4
• Mozilla/5.0 (Mobile; Nokia_8110_4G; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1 [ip:195.194.8.230]
• Mozilla/5.0 (Mobile; LOGIC_LOGIC_B8K_3G; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1.2
• Mozilla/5.0 (Mobile; Hammer_5Smart_4G; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.1
• Mozilla/5.0 (Mobile; Nokia_8110_4G; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1 [ip:146.200.55.55]
• Mozilla/5.0 (Mobile; Nokia_8110_4G; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1 [ip:212.159.94.181]
• Mozilla/5.0 (Mobile; Nokia 6300 4G; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.4 [ip:62.19.233.72]
• Mozilla/5.0 (Mobile; ENERGIZER_E241S; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.2
• Mozilla/5.0 (Mobile; Hammer_5Smart_4G; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.1
• Mozilla/5.0 (Mobile; iKU_V400; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1.2
• Mozilla/5.0 (Mobile; LYF/F320B/LYF-F320B-002-02-59-150622;Android; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.2
• Mozilla/5.0 (Mobile; AZUMI_L4K_4G; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.2.2
• Mozilla/5.0 (Mobile; MS352_512_3G; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1.2
• Mozilla/5.0 (Mobile; MAXCOM MK241; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1
• Mozilla/5.0 (Mobile; IPRO_I324MS4; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1.1 UCKai/1.2.0
• Mozilla/5.0 (Mobile; LYF/LF-2403/LYF-LF2403S-001-02-19-031221;Android; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5
• Mozilla/5.0 (Android 1.6; Mobile; rv:48.0) Gecko/48.0 Firefox/48.0
• Mozilla/5.0 (Android 4.0; Mobile; rv:48.0) Gecko/48.0 Firefox/48.0
• Mozilla/5.0 (Mobile; Digit_Digit4G-Power_4G; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.2
• Mozilla/5.0 (Mobile; LYF/LF2401/LYF-LF2401S-000-02-20-130422; Android; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5
• Mozilla/5.0 (Mobile; LYF/F101K/LYF-F101K-000-02-40-220422;Android; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5
• Mozilla/5.0 (Mobile; WW6L2407_4G; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1.1
• Mozilla/5.0 (Mobile; LYF/F41T/LYF-F41T-000-02-41-150422; Android; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5
• Mozilla/5.0 (Mobile; Digit_Digit4G-Music_4G; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.2
• Mozilla/5.0 (Mobile; LYF/F10Q/LYF-F10Q-000-01-34-080622; Android; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5
• Mozilla/5.0 (Mobile; Digit_Digit4G-Bold_4G; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.2
• Mozilla/5.0 (Mobile; LYF/F50Y/LYF-F50Y-001-03-28-280322;Android; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5
• Mozilla/5.0 (Mobile; GHIA_GQWERTY_3G; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1.2
• Mozilla/5.0 (Mobile; LYF/F61F/LYF-F61F-000-02-44-060422; Android; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5
• Mozilla/5.0 (Mobile; LYF/F320B/LYF-F320B-002-02-58-140422;Android; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.2
• Mozilla/5.0 (Mobile; ENERGY_E241S; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1.1
• Mozilla/5.0 (Mobile; Digit_Digit4G-Elite_4G; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.2
• Mozilla/5.0 (Mobile; LYF/F81E/LYF-F81E-000-02-42-260422; Android; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5
• Mozilla/5.0 (Mobile; Digit_Digit4G-Bold_4G; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.1 UCKai/1.2.0
• Mozilla/5.0 (Mobile; LYF/F221S/LYF-F221S-000-02-46-050422; Android; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5
• Mozilla/5.0 (Mobile; Digit_Digit4G-Bold_4G; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.1 UCKai/1.2.0
• Mozilla/5.0 (Mobile; ALCATEL A406DL; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.4 YouTube/1.92.52.K
• Mozilla/5.0 (Mobile; Geo_Phone_T15_4G; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.1 UCKai/1.2.0
• Mozilla/5.0 (Mobile; myPhone_UP_Smart_LTE_4G; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.1
• Mozilla/5.0 (Mobile; LYF/F271i/LYF_F271i-000-02-12-110422; Android; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5
• Mozilla/5.0 (Mobile; LYF/F211S/LYF-F211S-000-02-53-290322; Android; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5
• Mozilla/5.0 (Mobile; LYF/F41T/LYF-F41T-000-02-39-110122; Android; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5
• Mozilla/5.0 (Mobile; Doppio_TEXTER_3G; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1.1
• Mozilla/5.0 (Mobile; LYF/LF-2403N/LYF-LF2403N-001-02-51-231121;Android; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5
• Mozilla/5.0 (Mobile; LYF/F30C/LYF_F30C-001-10-40-020322; Android; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5
• Mozilla/5.0 (Mobile; LYF/F320B/LYF-F320B-002-02-56-250322;Android; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.2
• Mozilla/5.0 (Mobile; Multilaser_ZAPP; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1.1
• Mozilla/5.0 (Mobile; LYF/F300B/LYF-F300B-001-01-59-241121;Android; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5
• Mozilla/5.0 (Windows; U; Windows NT 6.1; rv:48.0) Gecko/20100101 Firefox/48.0
• Mozilla/5.0 (Mobile; Digit_Digit4G-Elite_4G; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.1 UCKai/1.2.0
• Mozilla/5.0 (Mobile; Symphony_PD1_4G_4G; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.2
• Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) Gecko/20100101 Firefox/48.0
• Mozilla/5.0 (Mobile; LYF/F220B/LYF-F220B-003-01-69-170322;Android; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5,gzip(gfe)
• Mozilla/5.0 (Mobile; KLT_K301; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1.1
• Mozilla/5.0 (Mobile; LYF/F211S/LYF-F211S-000-02-51-060122; Android; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5
• Mozilla/5.0 (Mobile; LYF/F220B/LYF-F220B-003-01-69-170322;Android; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5
• Mozilla/5.0 (Mobile; LYF/F61F/LYF-F61F-000-02-42-060122; Android; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5
• Mozilla/5.0 (Mobile; Nokia_800_Tough; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.2.2
• Mozilla/5.0 (Mobile; LYF/F50Y/LYF-F50Y-001-03-26-201221;Android; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5
• Mozilla/5.0 (Mobile; LYF/F271i/LYF_F271i-000-02-10-190122; Android; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5
• Mozilla/5.0 (Mobile; LOGICOM_LK284_4G; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.2
• Mozilla/5.0 (Mobile; WINTEK_W209_3G; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1.1
• Mozilla/5.0 (Mobile; Accent_50K; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1.1
• Mozilla/5.0 (Mobile; Crosscall_Core-S4_4G; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.2
• Mozilla/5.0 (Mobile; MAXCOM_MK281_512_4G; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1.1
• Mozilla/5.0 (Mobile; LYF/F30C/LYF_F30C-001-10-38-291121; Android; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5
• Mozilla/5.0 (Mobile; Xandos_X5_3G; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.1.1
• Mozilla/5.0 (Mobile; Digit_Digit4G-Defender_4G; rv:48.0; CAEN) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.1
• Mozilla/5.0 (Mobile; LYF/F220B/LYF-F220B-003-01-63-231121;Android; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5
• Mozilla/5.0 (Mobile; WIKIFMAX4G_512_4G; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.3.2
• Mozilla/5.0 (Mobile; LYF/F90M/LYF-F90M-000-03-51-141221; Android; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5
• Mozilla/5.0 (Mobile; ATT_EA211101; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5.4