Website Blocker is useful when you want to concentrate on work.
FEATURES :
Block the URL including the specified character string.
Block only between the specified time.
You can change the warning message.
You can switch ON/OFF of each function.
About Incognito window:
Open an Incognito window.
Open an extension manager on Incognito window.
Check an 'Allow in incognito' of 'Website Blocker'