The extension applies extra contrast using a CSS -webkit-filter, which is determined experimentally. The developer acknowledges that there might be better filters available and plans to improve the filter in future updates. Users are encouraged to send suggestions for improvements.

While HigherContrastForGoogleMaps provides enhanced visibility, there are a few known bugs. Entering or leaving street view does not automatically toggle the contrast, labels may appear slightly blocky, and the extension asks for permission to all pages due to the extensive number of top-level domains for Google Maps.

Overall, HigherContrastForGoogleMaps is a useful tool for Chrome users who want to enhance their Google Maps experience by increasing contrast and improving visibility.