Bug report: Error loading main page on Firefox 64

[bitterbit]

Summary

Error while loading main page on Firefox 64.

SecurityError: The operation is insecure.
Filename: https://gchq.github.io/CyberChef/main.js
Line: 115
Error: SecurityError: The operation is insecure.
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:64.0) Gecko/20100101 Firefox/64.0
CyberChef version: 8.22.0

Example

1. open https://gchq.github.io/CyberChef/
2. error

[n1474335]

Could you open the developer console (F12), reload the page, and then copy over the exact error message that you get please?

Thanks

[bitterbit]

[Kezxo]

Same here:

SecurityError: The operation is insecure.
Filename: https://gchq.github.io/CyberChef/main.js
Line: 115
Error: SecurityError: The operation is insecure.
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:64.0) Gecko/20100101 Firefox/64.0
CyberChef version: 8.23.0

I'm using firefox 64.0.2.
It worked previously but it stopped working right after I deleted all the cookies and site data using firefox. (both checkboxes)
The specific url I visited was https://gchq.github.io/CyberChef/#recipe=Generic_Code_Beautify()

Copied these from the console:

SecurityError: The operation is insecure. main.js:115
	value https://gchq.github.io/CyberChef/main.js:115:7453
	value https://gchq.github.io/CyberChef/main.js:97:6502
	value https://gchq.github.io/CyberChef/main.js:97:3186
	value https://gchq.github.io/CyberChef/main.js:97:456
	e https://gchq.github.io/CyberChef/main.js:278:421

TypeError: document.getElementById(...) is null[Learn More] CyberChef:103:17
	loadingErrorHandler https://gchq.github.io/CyberChef/:103:17

TypeError: this.chefWorker is undefined[Learn More] main.js:103:2267
	value https://gchq.github.io/CyberChef/main.js:103:2267
	value https://gchq.github.io/CyberChef/main.js:97:1746
	value https://gchq.github.io/CyberChef/main.js:167:483
	value self-hosted:974:17

[Kezxo]

Solved it by disabling Firefox extension Darkreader for the page and then reloading, looks like switching from Dynamic Theme generation to Static also solves it.
It seemed to work fine with the site before but I must have changed that theme generation setting globally which caused this on reload. I should have tested firefox safe mode first thing, sorry about that.

[mattnotmitt]

Ah right, this is the same as #450 then.