automatically change firefox proxies when they go down

I'm trying to find out if anyone knows of a way to automatically change out a bad proxy in firefox.

Say like a proxy dies, and i want to change it too a new one what is the best way? is there some way to do it automatically?

thanks

You want a software that makes a proxy from set of proxies and switches to next backend proxy when previous proxies are down. My personal choice is Glider. https://github.com/nadoo/glider
But it requires some Linux shell skills. Just use "High Availability load balancing".

Or use rotating proxies....that are rotated by the provider after x seconds.