What are the desired features that we need to consider when uninstalling firefox browser remotely via selenium

I need to start Firefox browser on a remote machine using Robot test case.

My environment: RHEL 6.9 Santiago, python: 2.6.6, Rebot 2.9.1, selenium2library

firewall rule created to access the remote computer (xxxx: 4444 /), so access to the remote endpoint is not a problem.

Successfully configured selenium mesh running on remote machine

Remote computer configuration details: Selenium 3.4.0 standalone server, Firefox browser version: 53.0.3 (32 bit)

This is my test case for a robot

*** Settings ***    
Library    SSHLibrary
Library    Selenium2Library


*** Keywords ***    
Start Browser
    [Arguments]    ${navigation}
    ${dict}    BuiltIn.Create Dictionary    seleniumProtocol=WebDriver    maxInstances=2    environment=firefox
    Open Browser    ${navigation}    firefox    None    http://192.168.1.1:4444/wd/hub    desired_capabilities=${dict}


*** Test Case ***
    Start Browser    http://www.google.com

      

        
        
        
      

    

I get the following error when running the test case from my PC. Error message

19: 50: 36.131 INFO Opening browser 'firefox' for base url   'http://www.google.com'

via remote server at   'http://x.x.x.X:YY/wd/hub'


19: 50: 36.131 WARN Keyword "Capture Page Screenshot" cannot be started on crash: no browser open
19: 50: 36.131 INFO / usr / lib / python2.6 / site-packages / selenium / webdriver / remote / webdriver.py: 97: DeprecationWarning: use FirefoxOptions to configure the browser profile DeprecationWarning)
19: 50: 36.132 FAIL KeyError: 'requiredCapabilities'

What's wrong with this approach? Any suggestions?