Bug 1491484 - disable browser_findbar.js on linux opt and pgo for frequent failures. r=jmaher

toolkit/content/tests/browser/browser.ini

@@ -94,6 +94,7 @@ uses-unsafe-cpows = true
 [browser_default_image_filename_redirect.js]
 [browser_f7_caret_browsing.js]
 [browser_findbar.js]
+skip-if = os == "linux" && !debug # Bug 1491484
 [browser_findbar_disabled_manual.js]
 [browser_isSynthetic.js]
 [browser_keyevents_during_autoscrolling.js]