Adding support for headless browser? about fantoccini HOT 3 CLOSED

Capabilities is really just a type alias for serde_json::Map<String, serde_json::Value>, so you can just use it directly :)

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As the Firefox docs you linked to mention, you need to pass in a capability named moz:firefoxOptions whose value should be something like:

serde_json::json!({ "args": ["--headless"] });

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serde_json::json returns a serde_json::Value and it was unclear to me how to actually convert that into a Capabilities, so I ended up using serde_json::from_str:

    let client = ClientBuilder::native()
        .capabilities(serde_json::from_str(r#"{"moz:firefoxOptions": {"args": ["--headless"]}}"#)?)
        .connect("http://localhost:4444")
        .await?;

Does this look about right?

Also, we could probably use an example for this.

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