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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
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Firefox has an experimental
.flagsproperty onRegExpinstances, which is not supported by any other JavaScript implementation (including Node, which is based on Chrome's V8 JS Engine). https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/flags#Browser_compatibility/regex/.flagsisn't a thing. You'll have to build a flags string or seomthing; that should fix the problem. Let me know how you get on.