The easiest way to match up that ID with more readable information is to check the troubleshooting information page. It has a table of all your installed extensions showing the title, ID, version, etc.

You can access that using either:

• menu: Help > Troubleshooting Information
• type or paste about:support in the address bar and press Enter

Can you find it there?

If it's not listed, i.e., it was on an old installation of Firefox but not your current one, you could search that ID on your favorite web search engine.

This GUID doesn't show up in your System Details List.

Is FEBE showing this from an archive or from your currently used profile?

A Google search doesn't bring up anything either.

I had already done my own web searches and found nothing. I even went to the compatibility reporting site. Because of all the secret install programs that get included with programs that users want, I removed the {f5c94424-427c-469f-a3be-b31d8850c826}. I still have backup copies.

If you rename the .xpi to .zip, you could explore the manifest file and other contents of the extension for insight into what it is.

Good idea. Let me take a look.

Got it. this is what it looks like;

I noticed part of a cloudfront URL in the first screen shot but not enough of it to search it and see whether it is associated with anything else.

I opened the file install.rdf with wordpad;

<?xml version="1.0" encoding="utf-8"?><!-- This Source Code Form is subject to the terms of the Mozilla Public
   - License, v. 2.0. If a copy of the MPL was not distributed with this
   - file, You can obtain one at http://mozilla.org/MPL/2.0/. --><RDF xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:em="http://www.mozilla.org/2004/em-rdf#">
   
  <Description about="urn:mozilla:install-manifest">
    <em:id>{f5c94424-427c-469f-a3be-b31d8850c826}</em:id>
    <em:version>0.1</em:version>
    <em:type>2</em:type>
    <em:bootstrap>true</em:bootstrap>
    <em:unpack>false</em:unpack>

    <!-- Firefox -->
    <em:targetApplication>
      <Description>
        <em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>
        <em:minVersion>19.0</em:minVersion>
        <em:maxVersion>25.*</em:maxVersion>
      </Description>
    </em:targetApplication>

    <!-- Front End MetaData -->
    <em:name>{f5c94424-427c-469f-a3be-b31d8850c826}</em:name>
    <em:description>{f5c94424-427c-469f-a3be-b31d8850c826}</em:description>
    <em:creator></em:creator>
    
    <em:updateURL>https://dummf1up57pez.cloudfront.net/watcher/update.rdf</em:updateURL>
    
  </Description>
</RDF>

Hi fredmcd-hotmail, based on what I see poking around on the site identified at the end, the site hosts an extension named "Spartipps von SparPilot.com" which uses various advertising services. I can't tell whether the extension you found is associated with that extension, or is something else. The scripts on the site use googloapis.com (note typo), gadsearch.com, and delta-search.com.

Edit: I didn't try to parse through most of the scripts, but this caught my eye as something you don't normally see:

console.log('!!! MUHAHAHAHA !!!',a,b,c);

Hmmm. I don't know what those sites are. I noticed the file is dated 10/31. I'm going to check my history to see what I can find. Many thanks for your help so far.