Search loading either doesn't work or takes a long time, I don't know

[Orisphera]

I'm trying to search using MakerCentral and it doesn't load for a long time (probably ever). I have Betterfox installed and I've tried searching with uBlock Origin disabled

[Orisphera]

I found that there's a problem with cross-origin policy, but don't know which resolution to close it with