I have been using this extension for little while but it keeps disabling. It directs me back to the chrome manage extensions page but there is no way to reset it all corrected. I have to uninstall it and reinstall it in order to have it work. Please fix this bug.
Nuance PowerMic Web Extension for Chrome
The extension allows you to use Nuance PowerMic buttons to intuitively work with speech recognition via Dragon Medical Embedded in applications for Google Chrome web browser