How does PageSourceSearch know what ef.com 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 ef.com 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 ef.com?

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 ef.com?

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

ef.com

Built with hls.js, @finsweet/attributes 2.7.1, webpack, @clerk/ui 1.34.0, @wix/design-system 1.328.0, @thumbmarkjs/thumbmarkjs 1.11.0, gather-vue 8.20.3, bromcom-ui 2.12.3, cloudinary-video-player 4.1.2, dashjs, @marimo-team/frontend 0.25.0, in-renderer-js 1.2.3 and more. 5 pages and 151 stored files, last crawled 2026-10-09.

54 libraries 0 identifiers 112 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
hls.js		2026-10-09
@finsweet/attributes	2.7.1	2026-10-09
webpack		2026-10-09
@clerk/ui	1.34.0	2026-10-09
@wix/design-system	1.328.0	2026-10-09
@thumbmarkjs/thumbmarkjs	1.11.0	2026-10-09
gather-vue	8.20.3	2026-10-09
bromcom-ui	2.12.3	2026-10-09
cloudinary-video-player	4.1.2	2026-10-09
dashjs		2026-10-09
@marimo-team/frontend	0.25.0	2026-10-09
in-renderer-js	1.2.3	2026-10-09
@feathery/react	2.98.1	2026-10-09
facebook-sdk		2026-10-09
@reachfive/identity-core	1.42.0	2026-10-09
@reachfive/identity-ui	2.1.0	2026-10-09
jspdf	4.2.1	2026-10-09
@cognigy/webchat	3.50.0	2026-10-09
oidc-client	1.11.5	2026-10-09
exceljs	4.4.0	2026-10-09
vimeo-player		2026-10-09
@widgetbot/crate	3.9.1	2026-10-09
@adalong/widget	7.15.1	2026-10-09
@moveo-ai/web-client	0.117.0	2026-10-09
@jupyter-widgets/html-manager	1.0.15	2026-10-09
@videojs/cdn	10.0.0-rc.2	2026-10-09
hapi-video	1.2.2	2026-10-09
@chatvolt/embeds	4.3.16	2026-10-09
tdesign-react	1.18.3	2026-10-09
ovenplayer	0.10.54	2026-10-09
webtorrent	3.0.21	2026-10-09
graphql-playground-react	1.7.28	2026-10-09
@recogito/annotorious	2.7.14	2026-10-09
@johanaarstein/dotlottie-player	1.5.23	2026-10-09
webcrypto	0.1.1	2026-10-09
@polar-sh/checkout	0.4.1	2026-10-09
nimbbl_sonic	6.3.2	2026-10-09
@swisspost/design-system-components	10.5.0	2026-10-09
replaywebpage	2.5.3	2026-10-09
@descope/web-components-ui	3.21.0	2026-10-09
tonweb	0.0.66	2026-10-09
@accusoft/pdf-viewer	3.11.158639	2026-10-09
chobitsu	1.8.6	2026-10-09
playable	2.15.4	2026-10-09
@linways/table-to-excel	1.0.4	2026-10-09
diffusion	6.12.2	2026-10-09
@okta/okta-signin-widget	7.49.1	2026-10-09
@formbird/angular-elements	8.5.10	2026-10-09
wonder-image	2.1.2-alpha.4	2026-10-09
@snapshot-labs/snapshot.js	0.17.5	2026-10-09
devexpress-richedit	26.1.5	2026-10-09
machinelearn	2.1.5	2026-10-09
@chativa/connector-directline	0.15.0	2026-10-09
coherentpdf	2.5.5	2026-10-09

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 ef.com 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
a.storyblok.com	connect	view source
a24099230963.cdn.optimizely.com	connect	view source
aomedia.org	connect	view source
api.dmcdn.net	connect	view source
api.martech-dev.eflangtech.com	connect	view source
api.martech.eflangtech.com	connect	view source
api.products.lt.eflangtech.com	connect	view source
api.storyblok.com	connect	view source
api.thumbmarkjs.com	connect	view source
app.optimizely.com	connect	view source
app.storyblok.com	connect	view source
axios-http.com	connect	view source
cdn.ef.design	connect	view source
cdn.embed.ly	connect	view source
cdn.jsdelivr.net	connect	view source
cdn.optimizely.com	connect	view source
cdnjs.cloudflare.com	connect	view source
challenges.cloudflare.com	connect	view source
connect.facebook.net	connect	view source
dashif.org	connect	view source
develrc-app.optimizely.com	connect	view source
dotenvx.com	connect	view source
ef-enterprise.oriserve.com	connect	view source
email-validator-prod.eflangtech.com	connect	view source
fast.wistia.com	connect	view source
fonts.googleapis.com	connect	view source
formsbuilder-schema-prod.eflangtech.com	connect	view source
formsbuilder-schema-qa.eflangtech.com	connect	view source
formtrace-qa.eflangtech.com	connect	view source
formtrace.eflangtech.com	connect	view source
github.com	connect	view source
img.litix.io	connect	view source
json-schema.org	connect	view source
logx.optimizely.com	connect	view source
maps.googleapis.com	connect	view source
noembed.com	connect	view source
open.spotify.com	connect	view source
player.twitch.tv	connect	view source
player.vimeo.com	connect	view source
prediction.cmab.optimizely.com	connect	view source
prod-lgen-campaigns.s3.eu-west-1.amazonaws.com	connect	view source
prospects-api-qa.eflangtech.com	connect	view source
prospects-api.eflangtech.com	connect	view source
qa.ef.com.tw	connect	view source
qa.ef.edu	connect	view source
raw.githubusercontent.com	connect	view source
reactjs.org	connect	view source
rum.optimizely.com	connect	view source
s3.eu-central-1.amazonaws.com	connect	view source
schema.org	connect	view source
schemas.xmlsoap.org	connect	view source
soundcloud.com	connect	view source
storage.googleapis.com	connect	view source
streamable.com	connect	view source
t1.daumcdn.net	connect	view source
time.akamai.com	connect	view source
use.typekit.net	connect	view source
vimeo.com	connect	view source
w.soundcloud.com	connect	view source
widget.mixcloud.com	connect	view source
www.chatbase.co	connect	view source
www.dailymotion.com	connect	view source
www.ef-australia.com.au	connect	view source
www.ef-czech.cz	connect	view source
www.ef-danmark.dk	connect	view source
www.ef-italia.it	connect	view source
www.ef-slovakia.sk	connect	view source
www.ef.at	connect	view source
www.ef.be	connect	view source
www.ef.co.hu	connect	view source
www.ef.co.id	connect	view source
www.ef.co.kr	connect	view source
www.ef.co.th	connect	view source
www.ef.co.uk	connect	view source
www.ef.com.ar	connect	view source
www.ef.com.br	connect	view source
www.ef.com.cn	connect	view source
www.ef.com.co	connect	view source
www.ef.com.ec	connect	view source
www.ef.com.es	connect	view source
www.ef.com.hk	connect	view source
www.ef.com.mx	connect	view source
www.ef.com.pa	connect	view source
www.ef.com.pe	connect	view source
www.ef.com.tr	connect	view source
www.ef.com.tw	connect	view source
www.ef.com.vn	connect	view source
www.ef.de	connect	view source
www.ef.do	connect	view source
www.ef.dz	connect	view source
www.ef.edu	connect	view source
www.ef.edu.pt	connect	view source
www.ef.fi	connect	view source
www.ef.fr	connect	view source
www.ef.lu	connect	view source
www.ef.lv	connect	view source
www.ef.nl	connect	view source
www.ef.no	connect	view source
www.ef.pl	connect	view source
www.ef.ro	connect	view source
www.ef.se	connect	view source
www.ef.si	connect	view source
www.ef.tn	connect	view source
www.efacademy.org	connect	view source
www.efjapan.co.jp	connect	view source
www.efswiss.ch	connect	view source
www.mixcloud.com	connect	view source
www.smpte-ra.org	connect	view source
www.tiktok.com	connect	view source
www.w3.org	connect	view source
www.youtube-nocookie.com	connect	view source
www.youtube.com	connect	view source

Stored pages and scripts

The newest stored version of each file, newest first@if (p.FilesTruncated) { (the 500 newest of 151) }. 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://cdn.jsdelivr.net/npm/hls.js@VERSION/dist/hls.min.js	js library	not fetched	2026-10-09	2026-10-09
https://cdnjs.cloudflare.com/ajax/libs/dashjs/VERSION/dash.all.min.js	js library	not fetched	2026-10-09	2026-10-09
https://connect.facebook.net/en_US/sdk.js	js library	not fetched	2026-10-09	2026-10-09
https://player.vimeo.com/api/player.js	js library	not fetched	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/0aeb9b3f.0214ac19cc8f4f9e.js	js	932 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/9402.12c083f0e0f13f74.js	js	333 B	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/8768.d9c714cd95e490fd.js	js	1.6 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/7480.1bafcce20a66b2a8.js	js	5.5 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/7326.8fe71ba84da7b3db.js	js	21.4 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/5055.cba3abed89c0e419.js	js	5.4 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/5531.033934390d6d34be.js	js	16.6 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/4530.b8e6627fce867430.js	js	11.3 KB	2026-10-09	2026-10-09
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https://www.ef.com/assetscdn/cefcom-funneling-si…/3717.ac269965afab68d0.js	js	45.1 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/2095.4977019d17f8bbab.js	js	20.7 KB	2026-10-09	2026-10-09
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https://www.ef.com/assetscdn/cefcom-funneling-si…/chunks/779.c463aa2159580aef.js	js	3.9 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/chunks/291.3e704721f4263726.js	js	1.8 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/de83865e.4e3696b0db6dcc78.js	js	500 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…layerWistia.9e9b0f6403f25243.js	js	10.3 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…ayerYouTube.06e63b7952ed6f35.js	js	11.9 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/897c3808.2a018a7b7b285022.js	js	603.4 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…layerTiktok.bf6545d4b401248b.js	js	7.6 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…tPlayerDash.2d99c29f9c1af57c.js	js	5.5 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…ayerPreview.911fae2b24f264f9.js	js	1.5 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…PlayerVimeo.b46d5457760695ee.js	js	48.2 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…ayerSpotify.1e45a6f1b66180ad.js	js	8 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…ctPlayerMux.c2e20ae1aaf8004e.js	js	99.1 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…ctPlayerHls.d2686e5e637dcc23.js	js	6.9 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…layerTwitch.ae6eb6dc7cef2710.js	js	9.2 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/0aeb9b3f.0214ac19cc8f4f9e.js	js	932 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-legal-nextjs…/chunks/862.b24643cd5640d674.js	js	3.6 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-legal-nextjs…/chunks/527.1b72269df955f137.js	js	172.6 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-legal-nextjs…/chunks/39.a843e03cfec7f24a.js	js	1.6 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/central-pages/cefco…/[...slug]-0957dcf2fc927e10.js	js	82.3 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/central-pages/cefco…/_error-83a32679c349f7a2.js	js	235 B	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/daskalos/efcwauid.min.js	js	31.4 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…ing-36401371241/_ssgManifest.js	js	173 B	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/_buildManifest.js	js	930 B	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…B...slug%5D-07d3c1a9b30418c0.js	js	14.9 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/3459-929af4e1d8bbad60.js	js	785.2 KB	2026-10-09	2026-10-09
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https://www.ef.com/assetscdn/cefcom-funneling-si…/pages/_app-8d74288228ca74a0.js	js	39.9 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/main-bbf28d60937b4f93.js	js	128.9 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/framework-b9000705413c00eb.js	js	136.7 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/webpack-327b71034b3e8668.js	js	4.7 KB	2026-10-09	2026-10-09
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https://www.ef.com/assetscdn/cefcom-funneling-si…/polyfills-42372ed130431b0a.js	js	110 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…ing-36401371241/_ssgManifest.js	js	173 B	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/_buildManifest.js	js	930 B	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…B...slug%5D-07d3c1a9b30418c0.js	js	14.9 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/3459-929af4e1d8bbad60.js	js	785.2 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/b8a8df81-98b4ebebc219f26a.js	js	216.3 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/pages/_app-8d74288228ca74a0.js	js	39.9 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/main-bbf28d60937b4f93.js	js	128.9 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/framework-b9000705413c00eb.js	js	136.7 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/webpack-e84fc60161588a70.js	js	4.7 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/6060.d1ea48af8b3d3b29.js	js	2.4 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/7705.c277302034e905f2.js	js	6.7 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/chunks/470.15dd20fba48e2084.js	js	2.5 KB	2026-10-09	2026-10-09
https://www.ef.com/assetscdn/cefcom-funneling-si…/4231.a42a85ca04f701e5.js	js	2.3 KB	2026-10-09	2026-10-09
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https://www.ef.com/cl/	html	315.2 KB	2026-10-09	2026-10-09
https://www.ef.com/cafr/	html	326.1 KB	2026-10-09	2026-10-09
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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.

2026-10-09 first crawl

5 pages, 151 files, 19.9 MB; 56 libraries, 0 identifiers, 112 third-party hosts
56 libraries added
- in-renderer-js 1.2.3
- diffusion 6.12.2
- gather-vue 8.20.3
- webpack
- 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
- graphql-playground-react 1.7.28
- @clerk/ui 1.34.0
- and 44 more
112 third-party hosts added
151 files added

Questions about ef.com

How does PageSourceSearch know what ef.com 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 ef.com 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 ef.com?: 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 ef.com?: 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.