GreatFire

mozilla.org

Mixed

Results vary across mozilla.org: of 190 URLs tested, 2 are blocked, 74 are disrupted some of the time, 108 load normally and 6 have no conclusive recent result. The Great Firewall resets the connection and breaks its TLS handshake. 5,042 tests have been run under this domain since 2011-03-04, the most recent on 2026-08-09.

Connection reset 1 TLS handshake failure 1
190URLs tested
2blocked
5,042tests all-time
2011first tested
16 h agolast tested

The site itself

http://mozilla.orgas of 2025Intermittenthttps://mozilla.orgIntermittenthttp://www.mozilla.orgNot blockedhttps://www.mozilla.orgNot blocked

Pages and subdomains (76)

http://mozilla.org/zh-TWas of 2026Intermittentftp://ftp.mozilla.orgNot enough datahttps://hg.mozilla.orgNot blockedhttp://ftp.mozilla.orgNot blockedhttp://vpn.mozilla.orgBlockedhttps://ftp.mozilla.orgas of 2026Not blockedhttps://air.mozilla.orgas of 2026Intermittenthttps://vpn.mozilla.orgNot blockedhttp://blog.mozilla.orgas of 2026Intermittenthttp://hacks.mozilla.orgas of 2026Intermittenthttps://blog.mozilla.orgas of 2026Not blockedhttps://wiki.mozilla.orgNot blockedhttps://chat.mozilla.orgNot blockedhttp://addons.mozilla.orgIntermittenthttp://www.mozilla.org/esas of 2026Not blockedhttps://paste.mozilla.orgUnresolvablehttps://hacks.mozilla.orgas of 2026Not blockedhttps://addons.mozilla.orgIntermittenthttp://support.mozilla.orgas of 2026Intermittenthttp://archive.mozilla.orgNot blockedhttps://www.mozilla.org/jaNot blockedhttp://bugzilla.mozilla.orgIntermittenthttp://download.mozilla.orgas of 2026Not blockedhttp://etherpad.mozilla.orgUnresolvablehttps://support.mozilla.orgNot blockedhttp://pastebin.mozilla.orgUnresolvablehttps://archive.mozilla.orgas of 2026Not blockedhttps://www.mozilla.org/ru/Not blockedhttp://www.mozilla.org/en-USas of 2026Intermittenthttps://download.mozilla.orgIntermittenthttps://etherpad.mozilla.orgUnresolvablehttp://developer.mozilla.orgIntermittenthttps://bugzilla.mozilla.orgNot blockedhttps://packages.mozilla.orgNot blockedhttps://www.mozilla.org/en-USas of 2026Intermittenthttps://www.mozilla.org/zh-CNas of 2026Not blockedhttps://discourse.mozilla.orgNot blockedhttps://developer.mozilla.orgNot blockedhttps://www.mozilla.org/aboutas of 2026Not blockedhttps://ssl-config.mozilla.orgas of 2026Not blockedhttp://www.mozilla.org/firefoxas of 2026Not blockedhttps://foundation.mozilla.orgas of 2026Not blockedhttps://blog.mozilla.org/latestas of 2026Not blockedhttps://commonvoice.mozilla.orgas of 2026Not blockedhttps://addons.mozilla.org/zh-CNas of 2026Intermittenthttps://blog.nightly.mozilla.orgas of 2026Not blockedhttps://developer.mozilla.org/zh-CNNot blockedhttps://www.mozilla.org/en-US/firefoxas of 2026Blockedhttps://addons.mozilla.org/ja/androidas of 2026Not blockedhttps://commonvoice.mozilla.org/zh-CNas of 2026Not blockedhttps://www.mozilla.org/fr/firefox/newNot blockedhttps://learning.mozilla.org/codemoji/Unresolvablehttps://www.mozilla.org/it/firefox/newIntermittenthttps://addons.mozilla.org/ja/android/as of 2026Not blockedhttps://www.mozilla.org/zh-CN/firefox/as of 2026Intermittenthttps://www.mozilla.org/ko/firefox/newIntermittenthttps://www.mozilla.org/en-US/firefox/Intermittenthttp://www.mozilla.org/en-US/firefox/fxas of 2026Not blockedhttps://ftp.mozilla.org/pub/mozilla.orgas of 2026Not blockedhttps://firefox-source-docs.mozilla.orgas of 2026Not blockedhttps://addons.mozilla.org/zh-CN/firefoxNot blockedhttp://www.mozilla.org/en-US/firefox/newas of 2026Not blockedhttps://input.mozilla.org/zh-CN/feedbackIntermittenthttps://addons.mozilla.org/en-US/firefoxas of 2026Intermittenthttps://www.mozilla.org/zh-CN/firefox/newIntermittenthttps://www.mozilla.org/en-US/firefox/newIntermittenthttps://www.mozilla.org/en-US/firefox/allas of 2026Intermittenthttps://www.mozilla.org/zh-CN/firefox/allas of 2026Intermittenthttps://www.mozilla.org/en-US/thunderbirdas of 2026Not blockedhttps://www.mozilla.org/es-CL/firefox/newas of 2026Intermittenthttps://www.mozilla.org/en-US/exp/firefoxas of 2026Intermittenthttp://www.mozilla.org/en-US/products/vpnas of 2026Not blockedhttp://www.mozilla.org/zh-CN/products/vpnas of 2026Not blockedhttps://www.mozilla.org/zh-CN/firefox/all/as of 2026Intermittenthttps://www.mozilla.org/en-US/products/vpnas of 2026Intermittenthttps://www.mozilla.org/zh-CN/products/vpnas of 2026Not blocked

Showing 80 of 190 tested URLs under this domain. See them all

About mozilla.org and the Great Firewall

Is mozilla.org blocked in mainland China?

Results vary across mozilla.org: of 190 URLs tested, 2 are blocked, 74 are disrupted some of the time, 108 load normally and 6 have no conclusive recent result. The Great Firewall resets the connection and breaks its TLS handshake. 5,042 tests have been run under this domain since 2011-03-04, the most recent on 2026-08-09.

How can I reach mozilla.org from mainland China?

A VPN or another circumvention tool routes the request outside mainland China, past the filtering that blocks mozilla.org. GreatFire runs GreatFire VPN; the Analyzer also tests the domains of many VPN and proxy providers, so you can check whether one is reachable before relying on it.

Elsewhere on the site

mozilla.org is ranked #92 among the world's most-visited domains (Tranco).

Sites of similar popularity:yandex.netopera.comnic.rusamsung.com

Most-blocked .org domainsEvery tested URL under mozilla.org

Each URL's status is its verdict over the last 90 days, the same one its own page headlines.