An upgrade should not wipe the entered keys if you don’t remove the extension prior to the upgrade. I have not checked how the extension stores the keys but beware when you clear the browser’s cache as it might also clear the keys depending on the cache clearing options you checked. After checking the extension and testing on another computer, it seems that clearing cache does not clear your keys from the extension, to remove all store keys, you would need to remove the extension itself.

To my knowledge, SteemConnect (from v2) does not store your private keys, it uses you active key to grant posting authority to the dapps that was using SteemConnect. The key is not needed later on when posting or upvoting. The private key is still requested for each transfer or settings request. Utopian got hacked in the past, the hacker could not retrieve the keys because there was nothing to retrieve, they could only use the SteemConnect token to perform the upvotes. If SteemConnect get hacked, just revoke your tokens.

However, if you want to be 100% you have not leaked your keys somehow then yes, go regenerate them. I still recommend you kept your owner key somewhere else safe.

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