Okay here's the deal.
I have installed switchproxy addon into firefox.
I got a bunch of working proxies from proxy-heaven. How do I know they are working? I used Charon proxy checker to check them, and they are working.
So I uploaded the txt file with the proxies to switchproxy, and when I activated the addon, my connections failed. Also, when I tried to visit a web page with the proxies, I would get this
I do not believe the problem is associated with switchproxy. The addon works.
I do not believe the problem is with the proxies. I checked them with Charon, and the proxies were just released today.
I believe the problem is related to my internet settings or browser settings.
I am running on Comcast Cable internet. My internet connection runs through a router.
I also tried wireless and direct connection, but neither worked.
If you can solve my problem, $5 to you.