[py]: bugfix `_get_firefox_start_cmd` referencing invalid `os._name`
[py]: bugfix `_get_firefox_start_cmd` referencing invalid `os._name`

valfirst/selenium,valfirst/selenium,joshmgrant/selenium,SeleniumHQ/selenium,titusfortner/selenium,joshmgrant/selenium,joshmgrant/selenium,titusfortner/selenium,titusfortner/selenium,joshmgrant/selenium,titusfortner/selenium,valfirst/selenium,titusfortner/selenium,valfirst/selenium,SeleniumHQ/selenium,SeleniumHQ/selenium,valfirst/selenium,valfirst/selenium,valfirst/selenium,joshmgrant/selenium,valfirst/selenium,joshmgrant/selenium,SeleniumHQ/selenium,titusfortner/selenium,joshmgrant/selenium,SeleniumHQ/selenium,SeleniumHQ/selenium,SeleniumHQ/selenium,joshmgrant/selenium,valfirst/selenium,SeleniumHQ/selenium,SeleniumHQ/selenium,valfirst/selenium,titusfortner/selenium,titusfortner/selenium,joshmgrant/selenium,valfirst/selenium,titusfortner/selenium,joshmgrant/selenium,joshmgrant/selenium,SeleniumHQ/selenium,titusfortner/selenium,titusfortner/selenium,SeleniumHQ/selenium