Android - Automation on Firefox browser issue

Hi everyone , I’m developing test script using Robotframework - Appium - Android for testing on Firefox browser.
Currently , I can use keyword “Go to - url” to navigate at specific url on Firefox browser . But when I’m trying to locate the element , it prints out “Element with locator xxx’ not found” <== this element is located rightly on Chrome browser before.
I just wonder that do we have step by step , setup the automation test for Firefox browser on Android? I think the problem is related to the driver.

To locate element on android browser try using inspector, because elements in desktop and in mobile browser have different locators