Bug 1398514 - Disable browser/components/extensions/test/browser/test-oop-extensions/browser_ext_tabs_executeScript_runAt.js on windows for frequent failures. r=me, a=test-only

browser/components/extensions/test/browser/browser-common.ini

@@ -137,6 +137,7 @@ skip-if = debug || asan # Bug 1354681
 [browser_ext_tabs_executeScript_multiple.js]
 [browser_ext_tabs_executeScript_no_create.js]
 [browser_ext_tabs_executeScript_runAt.js]
+skip-if = os == "win" # Bug 1398514
 [browser_ext_tabs_getCurrent.js]
 [browser_ext_tabs_insertCSS.js]
 [browser_ext_tabs_lastAccessed.js]