Blockchain.info Wallet Security Question (THANK YOU!)

[whatisthename]

Hi Guys,

(with kindness and respect I ask you please only reply with an answer if you know for sure)

With Blockchain.info I downloaded the firefox browser add-on for increased security. My question is this: should I leave auto-update on for the extension or turn if off? Is there a chance of a "hacked" version of the add-on to be uploaded to the servers, for people like me to download?

Sorry if this is a silly question...I'm just taking all precautions.