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 2026-10-29 09:40 · JSON
Last 7 days (6 observations)
Distinct clients per day (last 30 days, peak 6/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 | 218 |
q13d0313h3_55b375c5d22e_fc7519ff7bc2 | 48 |
q13d0314h3_55b375c5d22e_61e396c58b1f Match?Exact match in Thumbprint's published controlled catalog captures: firefox 132.0, firefox-esr 140.11.0esr, firefox-esr 140.16.0esr, +12 more.The fingerprint page shows the full measured match list. More on the catalog. | 34 |
t13d1714h2_5b57614c22b0_53a6d0ab1c42 | 28 |
t13d0616h2_da75d768228b_7bfe479b1697 | 9 |
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 |
t13d1311h1_f57a46bbacb6_e7c285222651 | 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 |
HTTP request (JA4H)
| fingerprint | co-occurrences |
|---|---|
ge20nr12enus_a72b71f519fc_000000000000_000000000000 | 71 |
ge20nr11enus_187a9385d229_000000000000_000000000000 | 68 |
ge20nn12enus_a72b71f519fc_000000000000_000000000000 | 56 |
ge20nr12enus_a4e537ffe33a_000000000000_000000000000 | 17 |
ge20nr10enus_b3034183f430_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 155.0.1, +28 more.The fingerprint page shows the full measured match list. More on the catalog. | 12 |
ge30nn11enus_7eaa533deebc_000000000000_000000000000 | 9 |
ge30nr10enus_d6360b5be5ba_000000000000_000000000000 | 8 |
ge20nr13enus_44e1f6d71293_000000000000_000000000000 | 8 |
ge30nr11enus_1d663b220259_000000000000_000000000000 | 7 |
ge30nr11enus_7eaa533deebc_000000000000_000000000000 | 7 |
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 155.0.1, +32 more.The fingerprint page shows the full measured match list. More on the catalog. | 87 |
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. | 51 |
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, +13 more.The fingerprint page shows the full measured match list. More on the catalog. | 14 |
1:65536;2:0;4:131072;5:16384|12517377|11:0:0:42|m,p,a,s | 13 |
1:65536;2:0;4:131072;5:16384|12517377|13:0:0:42|m,p,a,s | 13 |
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 158.0.1, firefox 155.0, +4 more.The fingerprint page shows the full measured match list. More on the catalog. | 12 |
1:65536;2:0;4:131072;5:16384|12517377|15:0:0:42|m,p,a,s | 12 |
1:65536;2:0;4:131072;5:16384|12517377|17:0:0:42|m,p,a,s | 11 |
1:65536;2:0;4:131072;5:16384|12517377|19:0:0:42|m,p,a,s | 9 |
1:65536;2:0;4:131072;5:16384|12517377|21:0:0:42|m,p,a,s | 7 |
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, +30 more.The fingerprint page shows the full measured match list. More on the catalog. | 74 |
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 |
|---|---|
US · United States | 65 |
NL · Netherlands | 59 |
AU · Australia | 57 |
DE · Germany | 35 |
CA · Canada | 30 |
SI · Slovenia | 25 |
SE · Sweden | 22 |
FR · France | 17 |
AT · Austria | 12 |
IT · Italy | 9 |
Network (ASN)
| fingerprint | co-occurrences |
|---|---|
AS38195 · Superloop | 54 |
AS215125 · Church of Cyberology | 33 |
AS60729 · Stiftung Erneuerbare Freiheit | 30 |
AS209854 · Cyberzone S.A. | 29 |
AS34779 · T-2, d.o.o. | 25 |
AS11878 · tzulo, inc. | 22 |
AS198093 · Foreningen for digitala fri- och rattigheter | 14 |
AS62744 · Quintex Alliance Consulting | 14 |
AS199218 · Proton AG | 9 |
AS40662 · Layer7 Technologies Inc | 9 |
TLS supported groups
| fingerprint | co-occurrences |
|---|---|
11ec,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 158.0.1, firefox 157.0, firefox 157.0.1, +5 more.The fingerprint page shows the full measured match list. More on the catalog. | 12 |
001d,0017,0018,0019,0100,0101 | 2 |
11ec,001d,0017,0018,0019,0100,0101 | 1 |
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).