Multiple tabs different proxies

Hi, is there any add-on for Chrome or Firefox that can allowed to have different proxy on each tab?
Also, is there any other third party browser solution for this? I saw some scripts online, but nothing like this. I need something that will allow me to have opened a number of tabs with different proxies at the same time.

Thank you in advance.

I haven't heard about any add-on's or extensions that would do the job. But I am sure there is a bot for multi-threading with unique proxy for each.