./toot-my-t-shirt --debug --mastodon-token=C0FEFE --mastodon-api-url=https://botsin.space/ --default-image-description="a nice description of the picture" --default-message="oh noes, another selfie" --store-dir="/tmp/selfies"
Some browsers require HTTPS, to allow access to the webcam. In the *ssl/* directory there is a self-signed certificate (completed with CA) to allow you to test it without the need to create your own. In production you are supposed to use your own certificate.