reflect-metadata-browser v0.1.12

Fork of https://rbuckton.github.io/reflect-metadata which works in Firefox. Using reflect-metadata package in a Firefox webextension content script will cause an error on the 4th line of makeExporter "Not allowed to define cross-origin object as property on Object or Array XrayWrapper". The exception is not displayed by default. You can only see it if you "pause on exceptions" in the debugger.

May not work in node environment.