You're going to have a hard time trying to get that working over the WAN (if that's even possible).
Wake on LAN is still encapsulated in an IP packet, so you can send it over the internet, and most WOL clients let you specify an IP. However your router will need to DNAT it to a broadcast address. Some routers have a check box for this (e.g. An ISP provided Technicolor router I have), some let you port forward to broadcast (e.g. Many routers, sometimes with workarounds), and some let you manually configure NAT (e.g. MikroTik routers).
So it is possible, but forwarding public internet traffic to a broadcast address seems like a bad idea, and I wouldn't recommend it. Why I know this: I used to do this in middle school, and it does work quite well.
This isn't about Firefox, and there are zero mentions of Firefox in the article. This is about Mozilla screwing over their volunteers by replacing their human written translations, with inaccurate machine translations written by a closed source LLM.