How to change the settings for 'Firefox' proxy?

IP Hider I downloaded because I thought it would be great for the most invisible for a while. I have nothing to hide, really. I uninstalled and now Firefox and Opera do not surf the web. Firefox, the browser you used, above all, says this when opened: "Error loading page, Firefox is configured to use a proxy server is refusing connections. Configuration is proxy browser right? Check the settings and try again. "It was working before, and I can not find the proxy settings anywhere. Could someone tell me where to find them? Thanks.

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