EDIT: I added a concise yet complete privacy policy at https://addons.vaultpit.io/en-US/firefox/addon/a-cookie-manager/privacy/

I have no explicit privacy policy because the add-on is not collecting any data.

If you would feel better, in absence of an explicit privacy policy, my policy is at https://robwu.nl/privacy/ :
"All software published under my personal name is free of ads, spyware and other nonsense."