User-Agent

Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:139.0) Gecko/20100101 Firefox/139.0

first seen 2026-07-02 22:53 · last seen 2026-09-14 23:29 · JSON

Decomposed attributes

Browser / client	`Firefox 139.0`
Operating system	`macOS 10.15`
Device class	`desktop`
Note	`inferred from the self-declared string — a claim, not a measurement; compare with the wire fingerprints above`

Co-observed signals

Signals from other families seen in the same observation. A fingerprint spread thinly across many lower-layer signatures is a classic inconsistency signal.

TLS ClientHello (JA4)

fingerprint	co-occurrences
`t13d251100_b78ed14e2fd0_ab7e3b40a677`	1
`t13d3612h1_018971650b2c_58ed7828516f`	1
`t13d301300_1d37bd780c83_5ae85263eb3b`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nn040000_e1d2031bdfea_000000000000_000000000000`	1
`ge11nn06enus_f03ddaa65e26_000000000000_000000000000`	1
`po11nn080000_4e91bb52a450_000000000000_000000000000`	1

TCP SYN (p0f)

fingerprint	co-occurrences
`4:55+9:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0`	1
`4:50+14:0:1460:mss*29,12:mss,sok,ts,nop,ws:df,id+:0`	1
`4:53+11:0:1460:26883,11:mss,sok,ts,nop,ws:df,id+:0`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`64240_2-4-8-1-3_1460_7`	1
`26883_2-4-8-1-3_1460_11`	1
`42340_2-4-8-1-3_1460_12`	1

Country

fingerprint	co-occurrences
`US` · United States	2
`NL` · Netherlands	1

Network (ASN)

fingerprint	co-occurrences
`AS14061` · DigitalOcean, LLC	1
`AS48090` · TECHOFF SRV LIMITED	1
`AS14618` · Amazon.com, Inc.	1