Every open PR you wrote and every PR waiting on your review, in one list. You tag each one with your own status, like Testing pending by me, and it stays with you across devices.
It needs a GitHub token. Create one here:
The token is stored only in this browser and is sent only to api.github.com. PRs across several orgs? Use a classic token with the repo and gist scopes instead, since a fine-grained token covers one org.