Bug 1625455 - disable test_ext_privacy.js on linux opt for frequent failures r=mixedpuppy

Differential Revision: https://phabricator.services.mozilla.com/D81339

toolkit/components/extensions/test/xpcshell/xpcshell-common.ini

@@ -106,7 +106,7 @@ skip-if = true # This test no longer tests what it is meant to test.
 [test_ext_permission_xhr.js]
 [test_ext_persistent_events.js]
 [test_ext_privacy.js]
-skip-if = appname == "thunderbird" || (os == "android" && debug)
+skip-if = appname == "thunderbird" || (os == "android" && debug) || (os == "linux" && !debug) #Bug 1625455 
 [test_ext_privacy_disable.js]
 skip-if = appname == "thunderbird"
 [test_ext_privacy_update.js]