Function install 

pub fn install(
    host_name: &str,
    description: &str,
    exe_path: &Path,
    chrome_allowed_origins: &[String],
    firefox_allowed_extensions: &[String],
    browsers: &[&str],
    scope: Scope,
) -> Result<()>

Install manifests for the given browser keys (from browsers.toml).

• chrome_allowed_origins is used for family="chromium" browsers
• firefox_allowed_extensions is used for family="firefox" browsers