diff --git a/toolkit/mozapps/extensions/test/xpcshell/xpcshell-shared.ini b/toolkit/mozapps/extensions/test/xpcshell/xpcshell-shared.ini
index b08b3476e1c5..6b34c36b9fca 100644
--- a/toolkit/mozapps/extensions/test/xpcshell/xpcshell-shared.ini
+++ b/toolkit/mozapps/extensions/test/xpcshell/xpcshell-shared.ini
@@ -304,7 +304,9 @@ run-sequentially = Uses global XCurProcD dir.
 run-sequentially = Uses global XCurProcD dir.
 [test_sourceURI.js]
 [test_webextension_icons.js]
+skip-if = appname == "thunderbird"
 [test_webextension.js]
+skip-if = appname == "thunderbird"
 [test_webextension_install.js]
 skip-if = appname == "thunderbird"
 [test_bootstrap_globals.js]
diff --git a/toolkit/mozapps/extensions/test/xpcshell/xpcshell.ini b/toolkit/mozapps/extensions/test/xpcshell/xpcshell.ini
index 3a0caf3de951..1a38e77da156 100644
--- a/toolkit/mozapps/extensions/test/xpcshell/xpcshell.ini
+++ b/toolkit/mozapps/extensions/test/xpcshell/xpcshell.ini
@@ -39,6 +39,7 @@ skip-if = appname != "firefox"
 [test_delay_update.js]
 [test_nodisable_hidden.js]
 [test_delay_update_webextension.js]
+skip-if = appname == "thunderbird"
 [test_dependencies.js]
 
 [include:xpcshell-shared.ini]