Bug 1593544 - Stop loading plugin provider modules in Thunderbird. r=jorgk

common/test/xpcshell/xpcshell.ini

@@ -5,7 +5,6 @@ support-files =
   data/**
 
 [test_bootstrap.js]
-skip-if = true # See bug 1593544.
 [test_bootstrap_const.js]
 [test_bootstrap_globals.js]
 [test_bootstrapped_chrome_manifest.js]

mail/test/mozmill/content-tabs/test-addons-mgr.js

@@ -32,17 +32,6 @@ function test_open_addons_with_url() {
   );
 
   mc.tabmail.switchToTab(0); // switch to 3pane
-
-  mc.window.openAddonsMgr("addons://list/plugin");
-  mc.sleep(0);
-
-  tab = mc.tabmail.currentTabInfo;
-  wait_for_content_tab_load(tab, "about:addons", 10000);
-  assert_true(
-    content_tab_e(tab, "category-plugin").selected,
-    "Plugins category should be selected!"
-  );
-
   mc.tabmail.closeTab(tab);
 }