Random User Agent per domain

[guzszisvww]

Hello.

This is a great and useful add-on. But some websites go crazy if a user has a User Agent changing many times during one session and stops working or blocking an account. It would be better if the random User Agent was chosen not for each request, but for each domain.

Need option "Random UA per domain". When this option is enabled, when opening a new tab for a domain
  - a random User Agent will be selected for this domain if there are no previously opened tabs for this domain,
  - the previous User Agent for this domain will be taken if there are previously opened tabs for this domain.

Thank.

[NoraCodes]

This is a very good idea, thank you!