To enable or disable OrbitNote from opening web PDFs automatically, right click on the OrbitNote icon to the right of the Chrome address bar and then select Options
If you want OrbitNote to automatically open web PDFs then check the box next to Open Web PDFs.
If unchecked, you can still open web PDFs with OrbitNote but will require an additional step. The web PDF will open up in Chrome's preview window and an OrbitNote icon will appear in the top right corner. When you click on that icon the PDF will open in OrbitNote.
Then click the X to close the screen