Hello @Alan Beber ,
Welcome to Microsoft Q&A forum.
There are many causes which may lead to this issue. If you hover over the message, will you see some tooltip? Sometimes, it’s related to security settings of specific extension. You may ask the author of the extension to confirm the settings and as I know, perhaps you can try to click the 3 dots(button) on the right-hand corner to check the security options.
Besides, there are also some awesome extensions that you can consider using, such as Live HTML Previewer and Live Server.
Since your question is related to extension and Visual Studio Code(different from Visual Studio and is currently not supported in Microsoft Q&A forums), please kindly post this question on Stack Overflow - visual studio code for better help.
Thanks for your understanding, have a nice day.
Sincerely,
Tianyu
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