Can you open www.mozilla.org/en-US/thunderbird from mainland China?
Yes.
All 2 recent conclusive tests connected normally.
2016first tested
0/2disrupted · last 90 days
3 mo agolast tested
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Other tested URLs on mozilla.org
Blocking varies across mozilla.org: 2 blocked vs 43 accessible among tested hosts.
http://mozilla.orgas of 2025Intermittenthttps://mozilla.orgIntermittenthttp://mozilla.org/zh-TWas of 2026Intermittentftp://ftp.mozilla.orgNot enough datahttp://www.mozilla.orgNot blockedhttps://hg.mozilla.orgNot blockedhttp://ftp.mozilla.orgNot blockedhttp://vpn.mozilla.orgBlockedhttps://www.mozilla.orgNot blockedhttps://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.orgas of 2026Not 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.orgNot blockedhttp://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-CNNot 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/newNot 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/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 blockedEach verdict covers the last 90 days of tests, as on that URL's own page.
Frequently asked questions
Is www.mozilla.org/en-US/thunderbird blocked in mainland China right now?
As of the last test on 2026-05-04, www.mozilla.org/en-US/thunderbird is not blocked in mainland China, based on GreatFire's live Great Firewall measurements.
https://www.mozilla.org/en-US/thunderbird · JSON