It's not working for me either. I've deleted Hitscraper (the Legacy one) and added it back on (the Export one). Added Tampermonkey and that didn't work either. Any ideas?
Got this from Reddit: Are you using Greasemonkey? It was updated to version 4 with the release of Firefox Quantum and broke some of the mturk scripts like Turkmaster and Hit Scraper. It changed how it runs user scripts. If you need these scripts working ASAP, you will need to install Tampermonkey or Violentmonkey and reinstall those scripts. Hope this helps.
Thank you! I don't think I had reinstalled the script after installing Tampermonkey. It looks like it's working now.