I opened the Firebase friendlychat-web (GitHub) sample project (web folder) in WebStorm.
Unfortunately, the storage.rules file opens without syntax highlighting. There's no WebStore plugin for Firebase development. The language used for the storage rules is a custom one.
Has anyone crafted / is aware of a syntax highlighter I could use?

Best you can do ATM is to add some colors by creating a new file type under Settings->Editor->File Types. 
You can get it to look like this:

This is how first page of my config looks like: 
The only downside is that highlighter is only aware of certain words but not of the syntax, so it would highlight word no matter where you use it.
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