My bank just broke compatibility with my password manager (could be the plugin's fault, I suppose) and another financial institution specifically told me that their site was not compatible with password managers. They have this 'nifty' feature which turns all but the last few chars of your username into stars on blur and I suspect they just didn't want to bother to do their js event handlers properly. Fortunately, it turns out I can make it work with the right sequence of clicking inside and outside the input boxes.