Mozilla Bypass Proxy Addons Software - Free Download
Download Hoxx VPN Proxy for Firefox 3.10.0 Hoxx VPN Proxy is a VPN browser extension dedicated to Firefox and Chrome, which gives you the possibility to connect to another country in order to hide your real IP address, replace it with a UltraSurf for Firefox - Download Dec 09, 2013
networking - Configuring Firefox to use a proxy from the
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Browser Extensions - Mozilla | MDN
Use the proxy API to proxy web requests. You can use the proxy.onRequest event listener to intercept web requests, and return an object that describes whether and how to proxy them.