How do I change the interval how often "Update available" appears?

How do I change the interval how often “Update available” appears to maybe once a week? I can’t update and that message pops up too often.

Reason I want to do that is because updating from 122 to 123 makes Firefox disappear on my old Linux Mint Cinnamon 17 that I installed separate from mint, I installed it from mozilla. Alternative topic could be asking how I could fix the problem. When I use Help/About to install Firefox all is well until I press Reboot to Update and Firefox disappears.

I hope I asked this question in the correct forum. If not, where?
Thanks - Mike