about blank cloaker to about:blank your tab so it won't go to your history
How to use, Step 1: Add a bookmark on chrome and name it whatever you want Step 2: Go to about:blank.html and copy the code and paste in url, then click the bookmark and it will go about:blank, enjoy!
BONUS: using this method, also it doesnt store to ur history. Teachers CANNOT see what ur doing through your history!