Avoid overwriting existing capabilities object

[vbyjsue]

fixes #15

[jsf-clabot]

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[christian-bromann]

Can we modify the integration tests to make sure that we can now also apply custom options?

[vbyjsue]

Looking into the tests and find that they don't work? I'm confused over this part:

if (!Array.isArray(config.firefoxProfile.extensions)) {
 return this.buildExtension();
}

If you supply an extension, no profile is added since it is done in buildExtension?
Also when I launch programmatically caps is passed as array in firefox-profile-lauch-service.js but with cli it's passed as an object which makes it never enter the profile setting part:

if (Array.isArray(_this2.caps))

Maybe I'm missing something?

[Filipoliko]

Bump
Hi, can this be merged, or are there still some changes required? Just ran into this bug and it would be great to have this working as expected.