Dropdown lists are not displaying their contents when selected on certain websites, including eBay. I have tried using Troubleshoot Mode and the dropdowns are still not displaying. Here's an example where I am seeing this behaviour: https://www.ebay.co.uk/itm/255536264049?var=555488018135 When I select the Resistance Level dropdown, nothing happens. It's the same for any listing that has a dropdown. This issue occurs in both RPM and Flatpak instances of Firefox. I have tried the same page in Chromium browser on the same computer and the dropdown functions correctly in that browser. I have also noted the same behaviour on other websites, such as train booking sites, but I don't have any other examples to share at the moment. It isn't an isolated eBay issue anyway. Any ideas? Is anyone else experiencing this issue?