Bug 1539615 - Disable window-open.tentative.https.sub.html on linux debug for frequent failures. r=jmaher

Differential Revision: https://phabricator.services.mozilla.com/D29558

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

testing/web-platform/meta/fetch/sec-metadata/window-open.tentative.https.sub.html.ini

@@ -1,6 +1,7 @@
 [window-open.tentative.https.sub.html]
   disabled:
     if os == "android" and not e10s: https://bugzilla.mozilla.org/show_bug.cgi?id=1499003
+    if debug and (os == "linux") and (bits == 32): https://bugzilla.mozilla.org/show_bug.cgi?id=1539615
   [Same-origin window, forced]
     expected: FAIL