How do I bypass marionette issues in Robot? - python-2.7

Question

I've been asked to evaluate Robotframework and happy with what I've seen for the most part. For it to be a viable option for me however, I need it to work in Firefox.
Marionette capabilities were a problem in my Ruby/Capybara environment, and I was able to shut it off.
Capybara.register_driver :selenium do |app|
Capybara::Selenium::Driver.new(app, :browser => :firefox, desired_capabilities: Selenium::WebDriver::Remote::Capabilities.firefox(marionette: false))
end
Getting the same thing in Robot / Python 2.7 / ff44.0 has generated an error in either direction.
When marionette is on:
${dc} Evaluate sys.modules['selenium.webdriver'].DesiredCapabilities.FIREFOX sys, selenium.webdriver
Set To Dictionary ${dc} marionette=${True}
Open Browser ${url_bck_auto} Firefox desired_capabilities=${dc}
I get this:
Our products rock | FAIL |
WebDriverException: Message: Unsupported Marionette protocol version
2, required 3
If I turn it off, gecko bumps me to ff51.0.1(32-bit) and I get a different message:
Our products rock | FAIL |
WebDriverException: Message: Can't load the profile. Possible firefox
version mismatch. You must use GeckoDriver instead for Firefox 48+.
Profile Dir: c:\users\blah\appdata\local\temp\tmpqzlxha\webdriver-
py-profilecopy If you specified a log_file in the FirefoxBinary
constructor, check it for details.
Geckodriver is version 0.15.0
Any help will be appreciated, thanks!

Answer 1

On Windows 10 I'm running Robot Framework 3.0, Selenium2Library 1.8.0, Selenium 3.0.2 and when I start your example, or the simplified single open browser http://google.com I get the same result when using Gecko 0.15.0. The browser starts but does not move to the desired page. The driver closes successfully but the browser stays open.
When using the same setup, but downgrading Geckodriver to 0.14.0 the results change, and the browser behaves as expected. Loads the page and closes when Close Browser keyword is called.
So, I recommend downgrading to Geckodriver 0.14.0.