This Safari extension is distributed through Apple's official AppStore, so it probably survived some automated malware tests. Apple requires code signing by the programmer. This guarantees that the app hasn't been altered and Apple can quickly stop all apps of one specific programmer from working, if any one of them is found to act malicious. That's about as save as it gets.Does Apple verify Safrai extensions to make sure there is no malicious code? The only extension I've ever used is Adblock Plus, mainly because it's the most popular one. Other than that, I have no extensions installed on Chrome.
EDIT: You can disable all extensions in the Safari preference panel before you start online banking.
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