Loading into Chrome can be helpful, but I am at the point where Chrome accepts the whole extension just fine and Safari just won't load it for some reason it will not tell me. I am not even transitioning an existing extension I am start from scratch and having this issue. Please if anyone has a way to make Xcode/Safari give a more helpful error, please post. I'll keep trying on my end, but this... is a weirdly frustrating blocker because it is probably something quite simple... but it won't tell me.