User-Agent
Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0
first seen 2026-06-11 00:12 · last seen 2026-09-11 06:49 · JSON
Last 7 days (4 observations)
Distinct clients per day (last 30 days, peak 3/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 / client | Firefox 140.0 |
|---|---|
| Operating system | Linux x86_64 |
| 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 |
|---|---|
t13d1715h2_5b57614c22b0_a54fffd0eb61 | 141 |
q13d0313h3_55b375c5d22e_fc7519ff7bc2 | 33 |
q13d0314h3_55b375c5d22e_61e396c58b1f Match?Exact match in Thumbprint's published controlled catalog captures: firefox 132.0, firefox-esr 140.11.0esr, firefox-esr 140.14.0esr, +11 more.The fingerprint page shows the full measured match list. More on the catalog. | 33 |
t13d1714h2_5b57614c22b0_53a6d0ab1c42 | 22 |
t13d1717h2_5b57614c22b0_3cbfd9057e0d Match?Exact match in Thumbprint's published controlled catalog captures: firefox 148.0.2, firefox 144.0.2, firefox 142.0.1, +6 more.The fingerprint page shows the full measured match list. More on the catalog. | 7 |
t13d1716h2_5b57614c22b0_0c27189014cf Match?Exact match in Thumbprint's published controlled catalog captures: firefox 148.0.2, firefox 144.0.2, firefox 142.0.1, +6 more.The fingerprint page shows the full measured match list. More on the catalog. | 6 |
t13d1312h2_a44d0ee8b3cc_e381dae6da6b | 3 |
t13d311000_e8f1e7e78f70_518fb456ca59 | 1 |
t13d1817h2_e8a523a41297_3cbfd9057e0d | 1 |
t13d1816h2_e8a523a41297_0c27189014cf | 1 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge20nr12enus_a72b71f519fc_000000000000_000000000000 | 52 |
ge20nr11enus_187a9385d229_000000000000_000000000000 | 48 |
ge20nn12enus_a72b71f519fc_000000000000_000000000000 | 26 |
ge20nr12enus_a4e537ffe33a_000000000000_000000000000 | 17 |
ge30nr11enus_1d663b220259_000000000000_000000000000 | 7 |
ge30nn11enus_7eaa533deebc_000000000000_000000000000 | 6 |
ge30nr11enus_7eaa533deebc_000000000000_000000000000 | 5 |
ge30nr10enus_d6360b5be5ba_000000000000_000000000000 | 5 |
ge20nr10enus_b3034183f430_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 154.0, +21 more.The fingerprint page shows the full measured match list. More on the catalog. | 5 |
ge20nr13enus_47bedc02e943_000000000000_000000000000 | 4 |
HTTP/2 frames (Akamai)
| fingerprint | co-occurrences |
|---|---|
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 154.0, +25 more.The fingerprint page shows the full measured match list. More on the catalog. | 62 |
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. | 28 |
1:65536;2:0;4:131072;5:16384|12517377|5:0:0:22|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0.3, firefox 154.0, firefox 153.0, +8 more.The fingerprint page shows the full measured match list. More on the catalog. | 12 |
1:65536;2:0;4:131072;5:16384|12517377|7:0:0:22|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0.3, firefox 155.0, firefox 154.0, +3 more.The fingerprint page shows the full measured match list. More on the catalog. | 10 |
1:65536;2:0;4:131072;5:16384|12517377|13:0:0:42|m,p,a,s | 9 |
1:65536;2:0;4:131072;5:16384|12517377|15:0:0:42|m,p,a,s | 9 |
1:65536;2:0;4:131072;5:16384|12517377|11:0:0:42|m,p,a,s | 8 |
1:65536;2:0;4:131072;5:16384|12517377|17:0:0:42|m,p,a,s | 8 |
1:65536;2:0;4:131072;5:16384|12517377|19:0:0:42|m,p,a,s | 6 |
1:65536;2:0;4:131072;5:16384|12517377|21:0:0:42|m,p,a,s | 5 |
TCP SYN (p0f)
TCP SYN (JA4T)
QUIC transport params
| fingerprint | co-occurrences |
|---|---|
q12_022106b74856 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 154.0, +25 more.The fingerprint page shows the full measured match list. More on the catalog. | 58 |
q13_29150affcbde Match?Exact match in Thumbprint's published controlled catalog captures: firefox 151.0.3, firefox 132.0, firefox 151.0.4, +3 more.The fingerprint page shows the full measured match list. More on the catalog. | 8 |
Country
| fingerprint | co-occurrences |
|---|---|
NL · Netherlands | 55 |
AU · Australia | 54 |
US · United States | 34 |
CA · Canada | 29 |
DE · Germany | 16 |
FR · France | 14 |
AT · Austria | 11 |
IT · Italy | 9 |
NO · Norway | 7 |
CH · Switzerland | 6 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS38195 · Superloop | 51 |
AS215125 · Church of Cyberology | 31 |
AS209854 · Cyberzone S.A. | 29 |
AS11878 · tzulo, inc. | 22 |
AS60729 · Stiftung Erneuerbare Freiheit | 11 |
AS40662 · Layer7 Technologies Inc | 9 |
AS7018 · AT&T Enterprises, LLC | 8 |
AS399820 · SPARKED HOST LLC | 8 |
AS3269 · Telecom Italia S.p.A. | 8 |
AS41653 · Aqua Ray SAS | 8 |
Cross-transport links
TLS ClientHello fingerprints observed from the same client via the beacon's correlation id on the other transport (e.g. this stack over TCP ↔ that stack over QUIC).