Bug 1603014 - Disable on OSX for frequent failures. r=jmaher

Differential Revision: https://phabricator.services.mozilla.com/D58698

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

browser/extensions/pdfjs/test/browser.ini

@@ -9,4 +9,4 @@ support-files =
 skip-if = verify
 [browser_pdfjs_views.js]
 [browser_pdfjs_zoom.js]
-skip-if = verify && debug && (os == 'win')
+skip-if = (verify && debug && (os == 'win')) || (!debug && os == 'mac') #Bug 1603014