[Bug-librejs] Removed JS feature used in LibreJS

[onionsalad]

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resource://librejs-prerelease/lib/script_entries/crypto.js, line 44:
return [this.toHexString(hash.charCodeAt(i)) for (i in hash)].join("");

Array comprehension is sadly now removed from Firefox...

Possible rewrite:
Array.from(hash).map(c => this.toHexString(c.charCodeAt(0))).join("");

shorter but nonstandard:
Array.map(hash, c => this.toHexString(c.charCodeAt(0))).join("");

Thank you for maintaining LibreJS,

onionsalad
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