Hi,
In case of ChatGPT, it will keep adding new HTML elements when answering your question. The extension will detect these changes and try to apply styling to newly created text. However, ChatGPT (like some other websites, i.e Reddit.com) is very strictly about the content it generated and will break the page if we modify the text too early.

For any similar websites that have issue, you can add them to the blacklist. Click on the extension icon -> Advanced -> pass the full link to "Blacklist Domains" -> Save/Apply. The extension will trip down the link and will save domain name only.

For more control, you can try "ALL", "THIS SITE" and "OFF" buttons in the extension menu.
- ALL: Use the extension for all websites. Use this together with blacklist for websites that you don't want to use the extension.
- THIS SITE: Use the extension for current website only (active tab). Use this if you only want to run the extension for a few websites that you like.
- OFF: Turn off the extension. For lazy people (like me) who don't want to open Add-ons page and then click on On/Off button.

I have updated the extension to blacklist "chat.openai.com" on default in version 1.6.11.