ALERT: Do Not Install OneClass!
A current phishing scam prompts you to install the OneClass Extension for Google Chrome web browser. If installed, this may send email on your behalf and it also attempts to collect your Blackboard username/password.
The OneClass Chrome Extension is not available directly via search in the Chrome Extensions Store and you are being phished with a specific link to install it.
Read the vendor-provided security advisory - Bb Security Advisory - LRN-120000 - Malicious OneClass Chrome Extension.pdf