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CloseDeveloper reply by Tomás Velázquez
Rated 4 out of 5 stars
Good add-on, but there is an errors when loading the list socks proxy from a file or url
http://50na50.net/GuifiProxyList.csv (free 50 proxy)
https://addons.mozilla.org/en-US/firefox/addon/guifiproxy/versions/?page=1#version-3.0.4
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