How does PageSourceSearch know what firezone.dev is built with?

From the site's own source code. The crawler stores the exact bytes of its pages and first-party scripts; the libraries are recognised by fingerprinting that code against known releases, the identifiers are read out of the tag snippets, and the third-party hosts are the script, iframe and stylesheet sources in the HTML and the absolute URLs inside the scripts. Nothing is inferred from headers or guessed.

How far back does the history of firezone.dev go?

To the first crawl the timeline lists. Every crawl records what the site looked like; when a file's content changes, its earlier version stays viewable because the stored chunks are never deleted, only mapped. A crawl that finds a file unchanged adds no copy.

Can I see an older version of a script from firezone.dev?

Yes. In the stored files list, every date under a file opens the version that was live at that crawl, with the same viewer as the current one. The raw bytes can be downloaded from there.

Which other websites use the same tracking IDs as firezone.dev?

Each identifier links to its reverse lookup, the list of every site in the index whose source carries the same id: the sites one analytics property or tag manager container is shared across.

Site profile

firezone.dev

Built with @clerk/ui 1.34.0, mermaid 12.0.0, dashjs 5.2.1, posthog-js 1.434.12, @marimo-team/frontend 0.25.0, @reachfive/identity-core 1.42.0, @reachfive/identity-ui 2.1.0, jspdf 4.2.1, kore-web-sdk 11.28.1, spectorjs 0.9.33, @mermaid-js/layout-elk 1.0.0, @moveo-ai/web-client 0.117.0 and more. 5 pages and 126 stored files, last crawled 2026-10-03.

rank 1,878,341 27 libraries 0 identifiers 87 third-party hosts 1 crawl open the site

Technologies and libraries

Recognised by fingerprinting the stored files and bundles against known releases; a version is the release the bytes match.

Library	Version	Seen
@clerk/ui	1.34.0	2026-10-03
mermaid	12.0.0	2026-10-03
dashjs	5.2.1	2026-10-03
posthog-js	1.434.12	2026-10-03
@marimo-team/frontend	0.25.0	2026-10-03
@reachfive/identity-core	1.42.0	2026-10-03
@reachfive/identity-ui	2.1.0	2026-10-03
jspdf	4.2.1	2026-10-03
kore-web-sdk	11.28.1	2026-10-03
spectorjs	0.9.33	2026-10-03
@mermaid-js/layout-elk	1.0.0	2026-10-03
@moveo-ai/web-client	0.117.0	2026-10-03
asciinema-player	3.17.0	2026-10-03
vditor	4.0.0	2026-10-03
volantis-static	0.0.1761982841160	2026-10-03
ovenplayer	0.10.54	2026-10-03
cytoscape	3.34.3	2026-10-03
graphql-playground-react	1.7.28	2026-10-03
@recogito/annotorious	2.7.14	2026-10-03
@stlite/browser	1.9.2	2026-10-03
@ant-design/x	2.9.0	2026-10-03
@prefecthq/prefab-ui	0.20.2	2026-10-03
@inkeep/agents-ui-js-cloud	0.17.8	2026-10-03
@joyfill/components	4.0.0-rc26	2026-10-03
@pydantic/ai-chat-ui	2.3.0	2026-10-03
@mermaid-js/parser	2.0.0	2026-10-03
alist-web	3.55.0	2026-09-25

Tracking, tag and verification IDs

No analytics property, tag manager container, pixel or site-verification token was found in the stored source.

Third-party hosts

Hosts outside firezone.dev that its pages load scripts, frames or stylesheets from, and that its own scripts name in absolute URLs (connect). Each links to every site loading from the same host.

Host	Loaded as	Found in
about.gitlab.com	connect	view source
accounts.google.com	connect	view source
ad.doubleclick.net	connect	view source
ade.googlesyndication.com	connect	view source
adservice.google.com	connect	view source
antithesis.com	connect	view source
api.hsforms.com	connect	view source
app.posthog.com	connect	view source
apple.github.io	connect	view source
apps.apple.com	connect	view source
beakon.com.au	connect	view source
bford.info	connect	view source
blogs.windows.com	connect	view source
cct.google	connect	view source
company.okta.com	connect	view source
crates.io	connect	view source
datatracker.ietf.org	connect	view source
developer.microsoft.com	connect	view source
developer.okta.com	connect	view source
developers.google.com	connect	view source
developers.onelogin.com	connect	view source
docs.cloud.google.com	connect	view source
docs.jumpcloud.com	connect	view source
docs.rs	connect	view source
docs.spring.io	connect	view source
docs.webkit.org	connect	view source
en.wikipedia.org	connect	view source
firezone.statuspage.io	connect	view source
github.com	connect	view source
globalworkplaceanalytics.com	connect	view source
hackaday.com	connect	view source
hashicorp.com	connect	view source
help.okta.com	connect	view source
intune.microsoft.com	connect	view source
jumpcloud.com	connect	view source
learn.microsoft.com	connect	view source
linkedin.com	connect	view source
m.youtube.com	connect	view source
news.ycombinator.com	connect	view source
ninjio.com	connect	view source
opensource.com	connect	view source
optro.ai	connect	view source
pagead2.googlesyndication.com	connect	view source
phoenixframework.org	connect	view source
play.google.com	connect	view source
proptest-rs.github.io	connect	view source
raw.githubusercontent.com	connect	view source
react.dev	connect	view source
registry.terraform.io	connect	view source
resources.owllabs.com	connect	view source
sans-io.readthedocs.io	connect	view source
sentry.io	connect	view source
swagger.io	connect	view source
tauri.app	connect	view source
techcrunch.com	connect	view source
us.i.posthog.com	connect	view source
us.posthog.com	connect	view source
vercel.live	connect	view source
without.boats	connect	view source
workos.com	connect	view source
workspace.google.com	connect	view source
www.apollotechnical.com	connect	view source
www.cisa.gov	connect	view source
www.corrdyn.com	connect	view source
www.flexjobs.com	connect	view source
www.foundationdb.org	connect	view source
www.gartner.com	connect	view source
www.github.com	connect	view source
www.google.com	connect	view source
www.googleadservices.com	connect	view source
www.googletagmanager.com	connect	view source
www.gravatar.com	connect	view source
www.linuxfoundation.org	connect	view source
www.microsoft.com	connect	view source
www.nomobo.tv	connect	view source
www.okta.com	connect	view source
www.pwc.com	connect	view source
www.redhat.com	connect	view source
www.rfc-editor.org	connect	view source
www.strongcompute.com	connect	view source
www.varonis.com	connect	view source
www.w3.org	connect	view source
www.wireguard.com	connect	view source
www.ycombinator.com	connect	view source
www.youtube.com	connect	view source
xkcd.com	connect	view source
yandex.com	connect	view source

Stored pages and scripts

The newest stored version of each file, newest first@if (p.FilesTruncated) { (the 500 newest of 126) }. Versions are the crawls at which the file was new or its content changed; each opens the file as it was then, rebuilt from the same stored chunks.

File	Kind	Size	Collected	Versions
https://www.firezone.dev/_next/static/chunks/9946.d0e48c79e94ade79.js	js	160 B	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/9846.625e49a6ecc98ae5.js	js	1.7 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/9592.9fd6ad24c593b750.js	js	11.4 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/9406.10eba5dc2bbf1c87.js	js	449 B	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/9154.e87bcc62190f763f.js	js	2 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/9031.cdabd25b83a39cfd.js	js	4.3 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/8533.6a9f6e36a4432660.js	js	38.8 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/8614.a180fc8ebfd2acb3.js	js	287 B	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/8523.6fb57f93e2aa0bf2.js	js	26.7 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/8323.dc2160d7f604de7f.js	js	15.6 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/8268.cd71172df668da30.js	js	510 B	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/8217.28fcfcb83772068e.js	js	9.8 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/7993.51c3b5d27d7ed483.js	js	17 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/7825.b4e9285085ee1280.js	js	71 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/7773.f01ff4b7f60d7525.js	js	27.9 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/7361.87ba28a146fa8dbc.js	js	40.1 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/7248.e08028812f64bd22.js	js	47.7 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/7111.5deed6dfa816e0a1.js	js	155 B	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/6884.ccdaf5c0f8bd3da4.js	js	30.8 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/6922.d1a2115a0e1849d2.js	js	8.4 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/6805.fae8ca56fa9337bb.js	js	160 B	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/6880.cba3761550abb72b.js	js	1.9 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/6372.392b778bd010629c.js	js	29 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/6303.87f1c570297ba12b.js	js	7.1 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/6289.81ccd6e00827e7cf.js	js	23.1 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/6075.544ee863fea82c99.js	js	164 B	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/6053.6c4818e932815621.js	js	165 B	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/6029.589b83b6d3abec32.js	js	159 B	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/6014.af4bd0905685b89c.js	js	158 B	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/5914.3f14c01d21b7cbe7.js	js	15.7 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/5852.ffaa6d9986899d2e.js	js	6.1 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/5745.79313f25a9345f3b.js	js	5.6 KB	2026-10-03	2026-10-03
https://www.firezone.dev/_next/static/chunks/5629.655c9561390b0f21.js	js	2.1 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/5547.48b0729d08ae483b.js	js	78.9 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/4995.0f1241b5f4a5fab0.js	js	160 B	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/4918.c17cb9df75516e7e.js	js	161 B	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/4653.960d7ebf324b3a57.js	js	10.7 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/4445.3a6b1567651516c4.js	js	346.5 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/4405.a3212616e659b2fe.js	js	19.8 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/4227.bd13615df507f043.js	js	61 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/4101.776ab85e9c1a8951.js	js	39.4 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/3938.5f146da304d3afd8.js	js	164 B	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/3710.a86856181072f691.js	js	4.9 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/3771.b4fefe626a14f765.js	js	443 B	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/3552.0ce08f187ecf2bd0.js	js	145.1 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/3519.426893512bd028a3.js	js	69.4 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/3537.ec2eaed5062ff249.js	js	449 B	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/3469.c9ff2ea8ec93ae9d.js	js	597 B	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/3403.a0f67cba64cce1a8.js	js	27.4 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/3331.22c23d8d1387372a.js	js	24.6 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/2462.f6103c39afccc4ff.js	js	10.7 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/3083.f1da62a11788a3b0.js	js	22 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/2155.f88b9636aa40b229.js	js	8.5 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/1785.cfefd8c96803e67a.js	js	45.3 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/1768.51603677bac0d198.js	js	50.4 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/1749.074d381859175981.js	js	166 B	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/1281.1862e3c7cc424ae0.js	js	30.6 KB	2026-10-03	2026-10-03
https://www.firezone.dev/_next/static/chunks/962.38645afe1daf7c85.js	js	22.2 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/584.b84519f611281a2f.js	js	160 B	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/521.d4b62b7a5c1a57d8.js	js	162 B	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/442.0b51c7b623f48d17.js	js	956 B	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/423.f0fbb199518f4a6a.js	js	33 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/393.255ba56333020cdb.js	js	1.5 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/137.80f7a7e698c114f5.js	js	156 B	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/94.1c7c6d7b51f80164.js	js	159 B	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/75.4d6dfbdcfb54806c.js	js	24.9 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/b671bc47.892ef9d0140eb85c.js	js	419.8 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/6c0b963a.03a214ace9105095.js	js	199 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/748c60ae.1423874aa17fd907.js	js	112.6 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/287c71e3.bc2cb7fa91989e75.js	js	100.6 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/21817e00.2ef2981277c486a2.js	js	634.4 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/cdfede43.ccd039dce42b3c57.js	js	257.8 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/b4a917a6.1b77b91fba320caf.js	js	113.5 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/b80a1887.9c6428d1fac7482e.js	js	133.4 KB	2026-10-03	current
https://www.firezone.dev/_next/static/W0JTQ4AwzmQULKhoiNUR0/_buildManifest.js	js	7.4 KB	2026-10-03	2026-10-03
https://www.firezone.dev/_next/static/W0JTQ4AwzmQULKhoiNUR0/_ssgManifest.js	js	80 B	2026-10-03	2026-10-03
https://www.firezone.dev/sd/gtm.js?id=GTM-NBZ4CD98	js	456.8 KB	2026-10-03	2026-10-03
https://www.firezone.dev/_next/static/chunks/app/about/page-2fda44482499d7a5.js	js	251 B	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/app…/page-4a3513008928fe91.js	js	9.7 KB	2026-10-03	2026-10-03
https://www.firezone.dev/_next/static/chunks/app/blog/layout-af11bbb4e21db89a.js	js	5.9 KB	2026-10-03	2026-10-03
https://www.firezone.dev/_next/static/chunks/app/blog/page-c9d49e9fa93a583c.js	js	533.6 KB	2026-10-03	2026-10-03
https://www.firezone.dev/_next/static/chunks/7231-23c10f47c1a3a6fe.js	js	11.6 KB	2026-10-03	2026-10-03
https://www.firezone.dev/_next/static/chunks/8086-f6c0c96af524fb19.js	js	10.5 KB	2026-10-03	2026-10-03
https://www.firezone.dev/_next/static/chunks/9496-ac4ebe894c57aeb5.js	js	10.5 KB	2026-10-03	2026-10-03
https://www.firezone.dev/_next/static/chunks/7176-6a08ac352da6832d.js	js	8.6 KB	2026-10-03	2026-10-03
https://www.firezone.dev/_next/static/chunks/c498c354-f63c87e43db5e9a1.js	js	1 KB	2026-10-03	2026-10-03
https://www.firezone.dev/_next/static/chunks/app…/page-c8bc86f7e697472f.js	js	5.8 KB	2026-10-03	2026-10-03
https://www.firezone.dev/_next/static/chunks/webpack-715469b55ba1301a.js	js	5.1 KB	2026-10-03	2026-10-03
https://www.firezone.dev/_next/static/chunks/polyfills-42372ed130431b0a.js	js	110 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/app/page-32f6fc0f3fdabde4.js	js	9.2 KB	2026-10-03	2026-10-03
https://www.firezone.dev/_next/static/chunks/3669-85fc55f3ab059348.js	js	123.4 KB	2026-10-03	2026-10-03
https://www.firezone.dev/_next/static/chunks/e9619662-1d95337497192d53.js	js	12.2 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/app/layout-700dcd4f74195f88.js	js	38.5 KB	2026-10-03	2026-10-03
https://www.firezone.dev/_next/static/chunks/1045-89637f8e8c1de465.js	js	8.8 KB	2026-10-03	2026-10-03
https://www.firezone.dev/_next/static/chunks/1194-95c4a3625d9f96c6.js	js	7.6 KB	2026-10-03	2026-10-03
https://www.firezone.dev/_next/static/chunks/9893-434ba8e19bdee90b.js	js	14 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/7396-c1c60dce516ba7d5.js	js	8.5 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/8c2c3dd5-f796dd9939fb3e74.js	js	276.8 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/2c82a0ee-dd7e34ff86f944e4.js	js	754 B	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/ab627e3b-8393cc65ec64b17e.js	js	22 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/main-app-3d2abb5520862fd3.js	js	922 B	2026-10-03	2026-10-03
https://www.firezone.dev/_next/static/chunks/1522-17303b6ae67ab72d.js	js	235.2 KB	2026-10-03	current
https://www.firezone.dev/_next/static/chunks/b7dfac1d-9e77e392bd645e61.js	js	196.3 KB	2026-10-03	current
https://www.firezone.dev/about	html	65.8 KB	2026-10-03	2026-10-03
https://www.firezone.dev/pricing	html	400.5 KB	2026-10-03	2026-10-03
https://www.firezone.dev/blog	html	65.2 KB	2026-10-03	2026-10-03
https://www.firezone.dev/product/newsletter	html	44 KB	2026-10-03	2026-10-03
https://www.firezone.dev/	html	142.6 KB	2026-10-03	2026-10-03
https://www.firezone.dev/_next/static/chunks/5745.782ccf602ec76265.js	js	5.6 KB	2026-09-25	current
https://www.firezone.dev/_next/static/chunks/1281.f1eee109c390a9f5.js	js	30.6 KB	2026-09-25	current
https://www.firezone.dev/_next/static/fqp8KTceaI2FfOl4ENSCC/_ssgManifest.js	js	80 B	2026-09-25	current
https://www.firezone.dev/_next/static/fqp8KTceaI2FfOl4ENSCC/_buildManifest.js	js	7.1 KB	2026-09-25	current
https://www.firezone.dev/_next/static/chunks/app…/page-34d4db9f52ded4e5.js	js	20.3 KB	2026-09-25	current
https://www.firezone.dev/_next/static/chunks/app/blog/layout-b4a6cf750060f188.js	js	5.8 KB	2026-09-25	current
https://www.firezone.dev/_next/static/chunks/app/blog/page-8e397ea2a2336b2a.js	js	12.4 KB	2026-09-25	current
https://www.firezone.dev/_next/static/chunks/840-780294a35bc821c8.js	js	8.4 KB	2026-09-25	current
https://www.firezone.dev/_next/static/chunks/c498c354-5ad4e42f8c4e2509.js	js	1.3 KB	2026-09-25	current
https://www.firezone.dev/_next/static/chunks/app…/page-ce80da560042a209.js	js	5.7 KB	2026-09-25	current
https://www.firezone.dev/_next/static/chunks/webpack-d9caa503b6358a9e.js	js	5.1 KB	2026-09-25	current
https://www.firezone.dev/_next/static/chunks/app/page-9ee36ae0fc31c64a.js	js	9.2 KB	2026-09-25	current
https://www.firezone.dev/_next/static/chunks/4415-5c57c9591d9d3b6c.js	js	117 KB	2026-09-25	current
https://www.firezone.dev/_next/static/chunks/5689-89fd81b5c63be368.js	js	6.5 KB	2026-09-25	current
https://www.firezone.dev/_next/static/chunks/app/layout-3e76b4ae5e0489a2.js	js	38.6 KB	2026-09-25	current
https://www.firezone.dev/_next/static/chunks/1194-eb39efcf3dbe08e4.js	js	7.5 KB	2026-09-25	current
https://www.firezone.dev/_next/static/chunks/1045-11b8eac363b97a78.js	js	8.7 KB	2026-09-25	current
https://www.firezone.dev/_next/static/chunks/main-app-750905a795d590f5.js	js	922 B	2026-09-25	current

Timeline

One entry per crawl, newest first, with what changed since the crawl before: libraries, identifiers, third-party hosts and files. Historical versions stay viewable because the stored chunks are shared between versions, never copied.

2026-10-03 first crawl

5 pages, 108 files, 6.2 MB; 26 libraries, 0 identifiers, 87 third-party hosts
26 libraries added
- @inkeep/agents-ui-js-cloud 0.17.8
- @clerk/ui 1.34.0
- @ant-design/x 2.9.0
- @joyfill/components 4.0.0-rc26
- @moveo-ai/web-client 0.117.0
- posthog-js 1.434.12
- jspdf 4.2.1
- @reachfive/identity-core 1.42.0
- @reachfive/identity-ui 2.1.0
- ovenplayer 0.10.54
- @recogito/annotorious 2.7.14
- dashjs 5.2.1
- and 14 more
87 third-party hosts added
- react.dev
- www.w3.org
- vercel.live
- yandex.com
- sentry.io
- app.posthog.com
- us.i.posthog.com
- us.posthog.com
- api.hsforms.com
- www.ycombinator.com
- github.com
- firezone.statuspage.io
- and 75 more
108 files added

Questions about firezone.dev

How does PageSourceSearch know what firezone.dev is built with?: From the site's own source code. The crawler stores the exact bytes of its pages and first-party scripts; the libraries are recognised by fingerprinting that code against known releases, the identifiers are read out of the tag snippets, and the third-party hosts are the script, iframe and stylesheet sources in the HTML and the absolute URLs inside the scripts. Nothing is inferred from headers or guessed.
How far back does the history of firezone.dev go?: To the first crawl the timeline lists. Every crawl records what the site looked like; when a file's content changes, its earlier version stays viewable because the stored chunks are never deleted, only mapped. A crawl that finds a file unchanged adds no copy.
Can I see an older version of a script from firezone.dev?: Yes. In the stored files list, every date under a file opens the version that was live at that crawl, with the same viewer as the current one. The raw bytes can be downloaded from there.
Which other websites use the same tracking IDs as firezone.dev?: Each identifier links to its reverse lookup, the list of every site in the index whose source carries the same id: the sites one analytics property or tag manager container is shared across.

Look up another site, browse sites by tracking ID, third-party host or technology. Site owners: see the crawler page for how stored pages are removed.