Bug 1603659 - Disable test_prompt_async.html on debug and asan for mochitest failures r=egao

Differential Revision: https://phabricator.services.mozilla.com/D57420

--HG--
extra : moz-landing-system : lando

toolkit/components/passwordmgr/test/mochitest/mochitest.ini

@@ -146,7 +146,7 @@ skip-if = toolkit == 'android' # bug 1535505
 skip-if = os == "linux" || toolkit == 'android' # Tests desktop prompts
 [test_prompt_async.html]
 fail-if = fission # bug 1582117
-skip-if = toolkit == 'android' # Tests desktop prompts
+skip-if = toolkit == 'android' || (debug || asan) # Tests desktop prompts # Bug 1603659
 support-files = subtst_prompt_async.html
 [test_prompt_http.html]
 skip-if = fission || os == "linux" || toolkit == 'android' # Tests desktop prompts, fission bug is 1582117