This comes so close to being a 5 star useful extension, but the notifications aren't persistent, so if you aren't sitting there and watching the second it pops up, you will miss it. :-( I would be happy to help make the update to this (I'm guess setting "requireInteraction" to True would do it) but I'm not able to find the source anywhere. I tried contacting the author but the web site listed returns an error. If it would be possible to make this update, I would enthusiastically update my review to 5 stars.