Would like to know which browser provides the most secure access to VPN from different countries. I am using chrome at this moment and did not have great experience of using VPN extensions.
As long as you have WebRTC disabled on the browser, it is safe to connect to a VPN using any browser.
Though, Opera is a popular web browser that comes with some great privacy features, like a free built-in VPN and a free ad blocker. If you just want a secure way to browse the web without ISPs being able to easily snoop on you and sell your data, Opera is your best option.