Proxy manager and switcher wót ProxyIPv4

The extension is intended for use by Proxy-IPV4 clients and not only for managing personal proxies or switch proxies in real time. The extension offers a wide range of anonymous browsing features.
- Using different user agents.
- Substitution of the language in requests depending on the proxy country.
- Substitution of the time zone depending on the proxy country.
- The ability to use proxies for specific sites.