Bug 1576876 - disable browser_sessionRestore.js on debug builds. r=MattN,egao

Differential Revision: https://phabricator.services.mozilla.com/D56864

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

browser/components/aboutlogins/tests/browser/browser.ini

@@ -32,4 +32,5 @@ skip-if = (os != "win" && os != "mac") # import is only available on Windows and
 [browser_openPreferencesExternal.js]
 [browser_openSite.js]
 [browser_sessionRestore.js]
+skip-if = debug # Bug 1576876
 [browser_updateLogin.js]