I want to use the Export ChatGPT Plugin but it says "Can't read or change data on this site". What can I do?

I want to export my chats in Markdown and I don't like how bloated Superpower GPT is, I just need to download chats. I wonder if this has to do with the relatively new addon domain restrictions feature. I followed the instructions on that page to set extensions.webextensions.addons-restricted-domains@mozilla.com.disabled to true in about:config. The addon still doesn't work after restarting Firefox.