Use full images instead of thumbnails in timeline.
The Bluesky handle is the URL of the account, commonly displayed with an "@" in front of it. Do not include the "@".
The specific post URI is the bit of the URL after "/post/". Do not include anything before that section.
If you just want to go to an account page, only the handle is required. Viewing a specific post requires both handle and URI.
On the Account page, you can get the debug info of nth displayed post via
document.getElementsByClassName('post')[n].debug
.