I've just been back through all my Firefox options. When I got down to extensions, I saw a recommendation to install FoxyProxy Standard. I run the Mozilla VPN. Would adding the proxy server extension do anything to improve security? Why would one run a proxy server AND a VPN? Is it likely to affect performance, ie, improve or slow it?
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Intel Core i5, 3570K, 3.40 GHz, 16 GB RAM, ECS Z77 H2-A3 Mobo, Windows 10 >HPE 64-bit, MS Office 2016
Using a proxy server as well as a VPN is unlikely to have much benefit, unless you want to be able to easily and quickly change the country that your web browser requests are coming from.