Remove FoxDriver dependency, use GeckoDriver instead

[autonome]

FoxDriver is basically unsupported. We should use GeckoDriver directly.

https://github.com/mozilla/geckodriver

[TechQuery]

WebDriver is based on HTTP, which can't send data by the server proactively, it's difficult to implement APIs such as page.on('console') or page.on('error').

And one more layer of proxy would reduce the performance of puppeteer-fx, not to mention Java-based Selenium driver.

[TechQuery]

But there is a problem: I find nothing about Promise resolving of Console evaluating in the document of Remote Debugging Protocol, many Async methods may become impossible...

Or Firefox is adapting CDP?

[autonome]

Maybe someday it will... https://bugzilla.mozilla.org/show_bug.cgi?id=1323098

My understanding that is that Selenium is a layer above GeckoDriver, so it would not be needed.

However, if you are correct about async APIs not being possible, then maybe we cannot do it.

The problem of FoxDriver remains. I have not looked through that code enough to know whether it's reasonable to fix it.

I would like to use something that is supported and standardized. I had hoped GeckoDriver would be that choice.

[TechQuery]

Someone is developing another Puppeteer package based on a custom-built Firefox...