Simple firefox extension "not compatible" error in Pale Moon

I'm trying to get a very basic extension working in Pale Moon (variation of Firefox).

lib\main.js:

var data = require("sdk/self");
var pageMod = require("sdk/page-mod");
pageMod.PageMod({
    include: "*.annoyingsite.com",
    contentScriptFile: [data.url("script.js")] 
});

lib\script.js:

document.getElementById("annoyingElement").setAttribute("style", "display: none;");

But I get the error:

[extension_name] could not be installed because it is not compatible with Pale Moon 24.7.2

I've tried reading the CFX docs and looking around on stackoverflow. The only hint I've found is perhaps it's something to do with minVersion/maxVersion in install.rdf, but I haven't got anywhere. Please help!

They changed the GUID for Pale Moon. I think it's a stupid move, but I guess it was necessary.

More information here:

MozillaZine :: Pale Moon has changed its GUID

PaleMoonForum :: Extensions and Pale Moon 25

you have to add this to your install.rdf:

  <em:targetApplication><!-- Pale Moon -->
     <Description>
        <em:id>{8de7fcbb-c55c-4fbe-bfc5-fc555c87dbc4}</em:id>
        <em:minVersion>25.0</em:minVersion>
        <em:maxVersion>25.*</em:maxVersion>
     </Description>
  </em:targetApplication>

So compile your addon to xpi, then rename to zip, then edit install.rdf, add GUID of pale moon, then zip it back up, then rename to xpi