How to use the firefox-profile function in firefox-profile

profileDirectory: config.srcProfileDir,
				destinationDirectory: config.profileDir
			}, 
			(err, profile) => {
				if (err || !profile) {
					reject(err);
				} else {
					profile.shouldDeleteOnExit(false);
					resolve(profile);
				}
			});

		} else {

			await fs.ensureDir(config.profileDir);
			let profile = new FirefoxProfile({
				destinationDirectory: config.profileDir
			});
			profile.shouldDeleteOnExit(false);
			resolve(profile);
		}
	});
}

const profileIsDirPath = await isDirectory(profilePath);
  if (profileIsDirPath) {
    log.debug(`Using profile directory "${profilePath}"`);
    destinationDirectory = profilePath;
  } else {
    log.debug(`Assuming ${profilePath} is a named profile`);
    destinationDirectory = await getProfilePath(profilePath);
    if (!destinationDirectory) {
      throw new UsageError(
        `The request "${profilePath}" profile name ` +
        'cannot be resolved to a profile path'
      );
    }
  }

  const profile = new FirefoxProfile({destinationDirectory});
  return await configureThisProfile(profile, {app, customPrefs});
}

export async function createProfile(
  {
    app,
    configureThisProfile = configureProfile,
    customPrefs = {},
  }: CreateProfileParams = {},
): Promise {
  const profile = new FirefoxProfile();
  return await configureThisProfile(profile, {app, customPrefs});
}

onPrepare (config, caps) {
        this.config = config
        this.caps = caps

        /**
         * don't do anything if no profile is specified
         */
        if (!config.firefoxProfile) {
            return
        }

        this.profile = new FirefoxProfile()

        for (let preference in config.firefoxProfile) {
            /**
             * extensions are getting set at the end
             */
            if (SPECIAL_PROPERTIES.includes(preference)) {
                continue
            }

            this.profile.setPreference(preference, config.firefoxProfile[preference])
        }

        if (this.config.firefoxProfile.proxy) {
            this.profile.setProxy(this.config.firefoxProfile.proxy)
        }