Rightclick not working in Firefox

Hello,
i’m currently stumped by the following problem: In the Javabased web interface that i’m testing, there is a right-click context menu that fills with different options depending on the table content it’s clicked on. This means that my test scripts usually look something like this:

WebUI.rightClick(findTestObject(’…FirstRow’))

WebUI.waitForElementVisible(findTestObject(’…Properties’), 3)

WebUI.click(findTestObject(’…Properties’))

This works fine in Chrome, even for more complicated versions in which I first have to hover over a specific menu point in the right-click context menu before choosing from a list of suboptions.
But when i run the tests in firefox, the context menu doesn’t show up even though the log says that the object (FirstRow in the example) was successfully right-clicked on.
I tried several options, from delays to mouse-over to focus, nothing seems to work. The context menu is quite finnicky and disappears as soon as the mouse is moved somewhere other than the area of the context menu.

Versions used:
Katalon Version 8.5.3
Firefox 61.0.2 (64-bit)