ffmpegwasm / ffmpegwasm/ffmpeg.wasm

CORS fails on Firefox

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Description

**Describe the bug**
On Firefox I can not use the library because of bad CORS:

Quellübergreifende (Cross-Origin) Anfrage blockiert: Die Gleiche-Quelle-Regel verbietet das Lesen der externen Ressource auf https://unpkg.com/@ffmpeg/ffmpeg@0.9.7/dist/ffmpeg.min.js. (Grund: CORS-Anfrage schlug fehl).

Modul-Quell-URI ist in diesem Dokument nicht erlaubt: "https://unpkg.com/@ffmpeg/ffmpeg@0.9.7/dist/ffmpeg.min.js".

Also the example https://codepen.io/jeromewu/pen/NWWaMeY can not be used on FireFox

How can this be fixed?

**Desktop (please complete the following information):**
- OS: Windows 10
- Browser FireFox
- Version 86

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