User-Agent

Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:154.0) Gecko/20100101 Firefox/154.0

first seen 2026-08-26 19:55 · last seen 2026-10-30 13:38 · JSON

Last 7 days (7 observations)

Distinct clients per day (last 30 days, peak 1/day)

Distinct clients are counted by IP-hash per complete UTC day — unlike observation counts this is insensitive to one chatty client, but NAT merges clients and address rotation splits them.

Decomposed attributes

Browser / clientFirefox 154.0
Operating systemLinux x86_64
Device classdesktop
Noteinferred 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)

fingerprintco-occurrences
t13d1517h2_8daaf6152771_3cbfd9057e0d Match?Exact match in Thumbprint's published controlled catalog captures: firefox 155.0.1, firefox 154.0, firefox 156.0, +8 more.The fingerprint page shows the full measured match list. More on the catalog.8
q13d0315h3_55b375c5d22e_dc5437974b47 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 155.0.1, +27 more.The fingerprint page shows the full measured match list. More on the catalog.1
t13d1516h2_8daaf6152771_0c27189014cf Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 155.0.1, firefox 155.0, +6 more.The fingerprint page shows the full measured match list. More on the catalog.1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn12enus_7e62679e718a_000000000000_0000000000005
ge20nr11enus_1d88e8a431b9_000000000000_0000000000002
ge20nn11enus_3901d4197baf_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 152.0.5, firefox 153.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.1
ge30nn10enus_9fcbd3f1e2d6_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 155.0.1, +25 more.The fingerprint page shows the full measured match list. More on the catalog.1
ge20nr12enus_7e62679e718a_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:131072;5:16384|12517377|3:0:0:42|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 152.0.5, firefox 152.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.4
1:65536;2:0;4:131072;5:16384|12517377|3:0:0:22|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 155.0.1, +32 more.The fingerprint page shows the full measured match list. More on the catalog.2
1:65536;2:0;4:131072;5:16384|12517377|17:0:0:42|m,p,a,s1
1:65536;2:0;4:131072;5:16384|12517377|19:0:0:42|m,p,a,s1
1:65536;2:0;4:131072;5:16384|12517377|21:0:0:42|m,p,a,s1

TCP SYN (p0f)

fingerprintco-occurrences
6:48+16:0:1420:mss*46,7:mss,sok,ts,nop,ws:flow:07
6:50+14:0:1440:mss*45,7:mss,sok,ts,nop,ws:flow:01
4:51+13:0:1344:mss*48,10:mss,sok,ts,nop,ws:df,id+:01

TCP SYN (JA4T)

fingerprintco-occurrences
65320_2-4-8-1-3_1420_77
64800_2-4-8-1-3_1440_71
64512_2-4-8-1-3_1344_101

QUIC transport params

fingerprintco-occurrences
q12_022106b74856 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 154.0, +30 more.The fingerprint page shows the full measured match list. More on the catalog.1

Country

fingerprintco-occurrences
FR · France7
NL · Netherlands1
IT · Italy1
CY · Cyprus1

Network (ASN)

fingerprintco-occurrences
AS12322 · Free SAS7
AS12876 · Scaleway SAS1
AS8612 · Smeraldo S.p.A.1
AS197648 · CLOUDLAYER8 LIMITED1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,0018,0019,0100,01018