Refused to get unsafe header "SourceMap"

I'm trying to use this module in the browser in combination with bluebird and webpack.

I'm loading it via `import 'source-map-support/register'` and all builds fine but when I run the code in the browser I throws

```
Refused to get unsafe header "SourceMap"
Refused to get unsafe header "X-SourceMap"
```

any ideas what is going wrong here?
- Chrome Version 43.0.2357.81 (64-bit) (Mac)
- source-map-support@0.3.1 node_modules/source-map-support