Proxy settings not forwarded to the user's browser

Following NXDRIVE-1291, the user's browser is used to make the authentication.
The issue is that an enventual proxy set in Drive will not be effective when opening the browser. Unless the same proxy is set on the OS side.

We need to find a way to forward this setting to the browser or let the user known what he needs to do.
As of now, only Chrome can be used with a proxy set via an argument:

"/Applications/Google Chrome.app" --proxy-server="https://username:password@proxy.tld:port"

But we will not maintain a list of browser with their eventual argument to manage those kind of stuff.