Bug 1257581: Disable test_chrome_ext_downloads_misc.html until intermittents are fixed. r=me

MozReview-Commit-ID: BXwW3noIbp3

toolkit/components/extensions/test/mochitest/chrome.ini

@@ -8,6 +8,7 @@ support-files =
 
 [test_chrome_ext_downloads_download.html]
 [test_chrome_ext_downloads_misc.html]
+skip-if = 1 # Currently causes too many intermittent failures.
 [test_chrome_ext_downloads_search.html]
 [test_chrome_ext_eventpage_warning.html]
 [test_chrome_ext_contentscript_unrecognizedprop_warning.html]