Is information not fully displayed in the Web GUI and scripts do not work?

Question

User interface

15.2 (7) E4
Cisco WS-C2960+24TC-L
The essence of the problem is that the Web GUI page does not fully display information, and "template engine variables" are visible in it, and the script falls into an error and, naturally, half of the functionality does not work.

Mozilla works in IE and the old version, I have a suspicion of CORS.
At some point, he does not allow the script to work out and falls into an error.
How can I fix this, what http server settings are there?

Answer 1

In the \utils\header\headerCtrl.js file of the html folder (web gui), I commented out the line of code "xmlHttp.send( null );"