I also ran into this problem and found it to be related to the NoScript extension blocking scripts from googletagmanager.com. For most sites, blocking scripts from googletagmanager.com is not a problem, but with these ASUS Helpdesk pages it leads to the following error in the Web Console. Use Ctrl+Shift+K to open the console, then select a value from the drop-down box on the ASUS page:
TypeError: window.ga is not a function Supportpd.js:1028:33 success/< https://www.asus.com/js/Supportpd.js:1028:33 dispatch https://www.asus.com/js/Jquery-1.12.4.min.js:3:12392 add/r.handle https://www.asus.com/js/Jquery-1.12.4.min.js:3:9156 receiveMessage resource://gre/modules/SelectContentHelper.jsm:293:13 After allowing scripts from asus.com and googletagmanager.com, selecting a value in the drop-down box resulted in a result set again. I can reliably reproduce the issue by blocking googletagmanager.com again. Hope this helps, please let us know! Thanks, Peter Nowee
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