I started getting 403 Forbidden in the consolewhen ever I interacted with the EditorExtensions window. After some digging I isolated it to the request below for github tags
https://api.github.com/repos/PlayFab/UnityEditorExtensions/git/refs/tags
When I entered it into my browser it gave me the following json message.
{"message":"API rate limit exceeded for <omitted my IP address>. (But here's the good news: Authenticated requests get a higher rate limit. Check out the documentation for more details.)","documentation_url":"https://docs.github.com/rest/overview/resources-in-the-rest-api#rate-limiting"}
At the time of writing this, the rate limiting has stopped and I no longer get the error, but I thought I would mention this here as I have seen other threads talking about a 403 error but I haven't seen any mention this cause.