Firefox: Fixing "sync encountered an error…" on OSX

I was trying to get sync up and running between multiple FF versions I kept getting a message saying:

sync encountered an error while syncing: Unknown error.

Sync has logs in about:sync-log

I was seeing this:

Crypto check failed: [Exception... "PK11_GenrateRandom failed"  nsresult: "0x80004005 (NS_ERROR_FAILURE)"  location: "JS frame :: resource://gre/modules/services-crypto/WeaveCrypto.js :: WeaveCrypto.prototype.generateRandomBytes :: line 550"  data: no]

Looking for a fix I found comment 33 in bug 1034979

|brew uninstall nss| and restart Fx seems to fix the problem for me.

And sure enough removing the brew installed nss package did the trick.

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