Options for webdriver

[Kirguir]

Motivation

Drivers for different browsers are configured differently - for the chromedriver "switches", which allow the use of fake media devices, are passed in arguments as a command line, for the geckodriver the same is done through preferences (about:config).

let request = json!({
       "capabilities": {
            "alwaysMatch": {
                "moz:firefoxOptions": {
                    "prefs": {
                        "media.navigator.streams.fake": true,
                        "media.navigator.permission.disabled": true,
                    },
                    "args": args,
                }
            }
        }
    });

There is currently no way to pass preferences.

Proposed Solution

Add the ability to pass preferences through environment variables

Alternatives

Configure the client for the web driver through a file, where you can describe all the options - arguments and preferences.