Bug 1086619 - tagging a mixed content blocker webconsole test with mcb. r=past

devtools/client/webconsole/test/browser.ini

@@ -275,6 +275,7 @@ skip-if = e10s # Bug 1042253 - webconsole tests disabled with e10s
 [browser_webconsole_bug_704295.js]
 [browser_webconsole_bug_734061_No_input_change_and_Tab_key_pressed.js]
 [browser_webconsole_bug_737873_mixedcontent.js]
+tags = mcb
 [browser_webconsole_bug_752559_ineffective_iframe_sandbox_warning.js]
 skip-if = e10s # Bug 1042253 - webconsole e10s tests (Linux debug timeout)
 [browser_webconsole_bug_762593_insecure_passwords_about_blank_web_console_warning.js]