this option passes willReadFrequently directly to getContext('2d') in frame_Grabber_browser
per MDN:
willReadFrequently Optional
A Boolean indicating whether or not this canvas uses software acceleration (instead of hardware acceleration) to support frequent read-back operations via getImageData().
willReadFrequently Optional A Boolean indicating whether or not this canvas uses software acceleration (instead of hardware acceleration) to support frequent read-back operations via getImageData().