Mac utilities in Firefox are out of date?

For several months, I have been using the Mac Automator workflow, which wraps HTML "em" tags around my selected text. It flags text on my Google Calendar, which is then triggered through the API to turn it into a webpage event schedule.

I would just highlight the word "big" in: "It's a big thing"

And run this short script:

on run {input, parameters}
    return "<em>" & input & "</em>"
end run

      

        
        
        
      

    

And now

"this is a <em>big</em> thing"

      

        
        
        
      

    

But this week, after the last Firefox update (53.0), trying to start the service returns an error message:

There was a problem with entering the Service [Show Workflow] [OK]

Is service support another feature that Firefox is removing, like JavaScript?

Could there be a Preference that I can tweak to start it up again?

Or do I need to learn how to create my own WebExtensions to avoid having to enter tags manually?

Thanks in advance!