https://techcrunch.com/2018/09/20/adguard-resets-all-user-passwords-after-account-hacks/

Popular ad-blocker AdGuard has forcibly reset all of its users’ passwords after it detected hackers trying to break into accounts.

The company said it “detected continuous attempts to login to AdGuard accounts from suspicious IP addresses which belong to various servers across the globe,” in what appeared to be a credential stuffing attack. That’s when hackers take lists of stolen usernames and passwords and try them on other sites.