Really nice extension. Missed the bangs when switching to startpage cause ddg's results were getting worse.

Shortly after installing this extension, I was pasting an error message I had encountered, part of which was "Error! System error", into the search bar. It kept opening the first result automatically, and I didn't realize why until I saw the "!" bang, which opens the first result automatically.

The good thing was that the dev included a blacklist mode and whitelist mode. So I could turn on blacklist mode and blacklist "!" to avoid opening the first result, and turn on whitelist mode to use only the bangs I want. Be sure to check the settings to customize.