Manually set properties httpProxyPort and sslProxyPort for Firefox (#702)
Manually set properties httpProxyPort and sslProxyPort for Firefox (#702)

* Manually set properties httpProxyPort and sslProxyPort for selenium proxy settings in firefox

* Change double quotes to single quotes to match style.

tobli/browsertime,sitespeedio/browsertime,sitespeedio/browsertime,sitespeedio/browsertime,sitespeedio/browsertime