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Firefox browser keep showing " proxy server not found"

You can check out the resolution and troubleshoot by reset Firefox to factory default. This will end up all your problems that you are facing now with your browser.
It sounds like you may have local malware redirecting your traffic. I would double check your FireFox or even IE proxy settings, as sometimes Firefox can be set to use your system default setting.
Go to the internet options and then look for proxy setting then set the desired setting their and then you will not get proxy not found error.