strange SessionStore messages in browser console

[thosrtanner]

I was looking at my debug log recently and saw this message come up at startup:

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TypeError: this._prefBranch is undefined

linking to palemoon.res!/modules/sessiostore/SessionStore.jsm line 1884 which contains this code:

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    // Limit number of back/forward button history entries to save
    let oldest, newest;
    let maxSerializeBack = this._prefBranch.getIntPref("sessionstore.max_serialize_back");

So far it doesn't seem to have caused any problems, though I'm not sure whether or not it's related to these messages (at startup again)

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SessionStore: [Exception... "Component returned failure code: 0x80004002 (NS_NOINTERFACE) [nsIObjectInputStream.readObject]"  nsresult: "0x80004002 (NS_NOINTERFACE)"  location: "JS frame :: resource:///modules/sessionstore/SessionStore.jsm :: _deserializeHistoryEntry :: line 3426"  data: no]

or these intermittent messages:

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SessionStore: [Exception... "Component returned failure code: 0x80040111 (NS_ERROR_NOT_AVAILABLE) [nsIObjectOutputStream.writeCompoundObject]"  nsresult: "0x80040111 (NS_ERROR_NOT_AVAILABLE)"  location: "JS frame :: resource:///modules/sessionstore/SessionStore.jsm :: _serializeHistoryEntry :: line 2095"  data: no][code]