Extensions have two sourceMapURL comments

Created by: felixfbecker

Check out https://sourcegraph.com/-/static/extension/2542-sourcegraph-typescript.js?bs7wauimg2mw--sourcegraph-typescript

scroll to the bottom and you see

//# sourceMappingURL=/extension.map
//# sourceMappingURL=https://sourcegraph.com/-/static/extension/2542.map

only the latter should be there. The former comment was added by Parcel.

This is added dynamically by the backend, so looks like the backend doesn't remove existing comments.

I suspect this is why source maps don't work in Firefox.