Kirby Backend unusable after domain migration

Kirby 2 Questions 🤔
1

I have a Website that was moved from the Prod Domain to a Dev domain.
When logging into the Backend No Icons (font-awesome) are displayed, modals cant be opened (like uploading files) or editing structure fields.

No Code was changed when moving from prod to dev - In my config.php there is no c::set(‘url’) set, I havent modified the core or anything.
In the Webinspector Tool Console I get the errors “$ is not defined”. So I guess it has to be a problem with the default integration of jquery in the Backend.

Is there any way to fix this?

2

Looks like jQuery is not loaded for some reason. If you check the network tab, what do you see there regarding jQuery?

3

I am using Kirby 2.5.12. This is what is beeing loaded in the Backend:

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4

The only thing that looks irregular is the inject.js file. Where does that come from? Is that some sort of browser extension being loaded?

5

Yes it comes from the Extension “Wappalyzer” but even when disabled I get the same problem.
In other Kirby installations I don’t this problem…