with files from archapps.sfs report them on Standard ArchPup 13.2.1 topic not xfce related one.
Currently firefox has Categories=Application;Network;
it's listed under Internet in the Openbox menu.
Change it to Categories=Application;WebBrowser, and it moves to Other
Try with Categories=Application;Internet again it moves to category Other
WTF
![Evil or Very Mad :evil:](./images/smilies/icon_evil.gif)
Later:
Ok, think I've found it
Test this in XFCE:
Categories=Network;WebBrowser;