Corn's Flask or the North Reminder v1.0 by OmeCorn
A lightweight AddOn that flashes the Flask of the Frost Wyrm button when the buff is inactive.
Corn's Flask Reminder can be found here.
For Alchemists. An AddOn that flashes up when your FotN is not active. For a more detailed description see my Flask Reminder addon.
A special thank you goes out to sigmalmtd and his DivinePleaReminder for the idea and the code I based this on.