Open Browser fails if desired capabilities is a dict

This issue goes away if you revert to SeleniumLibrary 3.2.0

Steps to reproduce the issue

*** Settings ***
Library    SeleniumLibrary
*** Test Cases ***
Repro
    ${caps}    Create Dictionary    javascriptEnabled=${True}
    Open Browser    https://www.google.com    desired_capabilities=${caps}

Error messages and additional information

Starting test: SL-bug.DesiredCapabilitiesBug.Repro
20190102 14:57:16.375 : TRACE : Arguments: [ 'javascriptEnabled=${True}' ]
20190102 14:57:16.376 : TRACE : Return: {'javascriptEnabled': True}
20190102 14:57:16.376 : INFO : ${caps} = {u'javascriptEnabled': True}
20190102 14:57:16.377 : TRACE : Arguments: [ 'https://www.google.com' | desired_capabilities={'javascriptEnabled': True} ]
20190102 14:57:16.377 : INFO : Opening browser 'firefox' to base url 'https://www.google.com'.
20190102 14:57:16.379 : TRACE : Arguments: [  ]
20190102 14:57:16.380 : INFO : Cannot capture screenshot because no browser is open.
20190102 14:57:16.380 : TRACE : Return: None
20190102 14:57:16.382 : FAIL : TypeError: __init__() got an unexpected keyword argument 'javascriptEnabled'
20190102 14:57:16.382 : DEBUG : Traceback (most recent call last):
  File "/ws/SL-bug/venv/lib/python2.7/site-packages/SeleniumLibrary/__init__.py", line 372, in run_keyword
    return DynamicCore.run_keyword(self, name, args, kwargs)
  File "/ws/SL-bug/venv/lib/python2.7/site-packages/SeleniumLibrary/base/robotlibcore.py", line 102, in run_keyword
    return self.keywords[name](*args, **kwargs)
  File "/ws/SL-bug/venv/lib/python2.7/site-packages/SeleniumLibrary/keywords/browsermanagement.py", line 131, in open_browser
    ff_profile_dir, remote_url)
  File "/ws/SL-bug/venv/lib/python2.7/site-packages/SeleniumLibrary/keywords/browsermanagement.py", line 456, in _make_driver
    remote_url=remote, profile_dir=profile_dir)
  File "/ws/SL-bug/venv/lib/python2.7/site-packages/SeleniumLibrary/keywords/webdrivertools.py", line 58, in create_driver
    profile_dir)
  File "/ws/SL-bug/venv/lib/python2.7/site-packages/SeleniumLibrary/keywords/webdrivertools.py", line 109, in create_firefox
    **desired_capabilities)
Ending test: SL-bug.DesiredCapabilitiesBug.Repro

Expected behavior and actual behavior

When I follow those steps, keyword fails

I was expecting browser to open

Environment

Browser: Any Browser driver: Any Operating System: macOS 10.13.2 Libraries

• Robot Framework: 3.1
• Selenium: 3.141.0
• SeleniumLibrary: 3.3.0
• Interpreter: CPython 2.7.15

This was be caused by https://github.com/robotframework/SeleniumLibrary/commit/159206fbe62b7189f893f5e4d60b47eaacd4b700#diff-566132cdf5a534d7e99598e5acc77378. _parse_capabilities returns the capabilities as is when they are dict. But it needs to return keyword args as it does for string type desired capabilities or Falsey desired capabilities.

[ombre42]

Thanks so much for the quick turnaround. I did pip install git+https://github.com/robotframework/SeleniumLibrary.git. Then I changed the test such that it requires the caps to work (go to site behind a proxy).

    ${caps}    Evaluate    {"proxy": {"proxyType": "manual", "socksProxy": "localhost:3130", "socksVersion": 5}}
    Open Browser    https://somehost/    chrome    desired_capabilities=${caps}

Worked like a charm.

[aaltat]

This issue should be fixed now in the master branch. @ombre42 could install from master and try it out? I will make hotfix release, but would like to wait few days so that more people have time to try 3.3.0 out and discover other possible regression bugs.