There is a lot of errors. Please press Ctrl + Shift + i and examine errors and warnings in the Console.

Yes, here is screenshot of the error messages appearing. Can you give me advice how to fix this?

I don't know why it breaks your menu. I'd guess it's something with cookies.

It's completely new browser fresh installed and it's occurring on multiple devices and different browsers

Do you know why Megamenu is not working on Mozilla, please give me feedback, if I need to leave you more information about this issue?

Also can you try to fix this problem on your side, since we have this problem only on Mozilla browsers or advise me how can we fix it on our side?

I think that you need to add class="active" to that lamps section if I compare it with the others. Screenshot with that class added.

Yes, but that is still not resolving this problem... Can you also help me with that one?

I still haven't got an accurate answer on how this can be fixed on Mozilla browser or why Megamenu is not working not working on this browser?

I did some more testing and sometimes I first get a short mega-menu and sometimes (Ctrl+F5 followed by F5) this menu gets replaced by a longer menu with "Sale items" and that also shows the Collections menu and the Lamp menu on hover. I can't catch this with the Inspector because I'm not able to get that extended menu with the Devtools opened, so I have no idea what is going on.

Try to ask advice on a web development oriented forum.

• https://support.mozilla.org/en-US/kb/where-go-developer-support