Ads not loading in Firefox

[franzthiemann]

When accessing the new tab page through firefox, either by entering the url manually or by self-building the browser plugin, ads do not load.
Enhanced tracking prevention is disabled and no ad / scriptblockers are used.

To my knowledge this seems to be a problem with nextJS according to the following errors in the browser console:
Error: Request failed with status code 404 NextJS 69 [a2a2a217b33214a57b011678b0aba3b3738f6b36.dc2038cd5c0a274237dd.js:1:165681](https://tab.gladly.io/newtab/_next/static/chunks/a2a2a217b33214a57b011678b0aba3b3738f6b36.dc2038cd5c0a274237dd.js)

and probably due to this:
Uncaught TypeError: n is not a function

I was able to test the following scenarios and reproduce the problem:
Firefox 126.0b9 - Linux
Firefox 125.0.3 - Linux
Firefox 126.0 - Windows