Thank you for your review and feedback! I sent out an update a few days ago that I believe should fix the tab favicon changing? But please let me know if it doesn't, either here or at the contact email I added to the description.

For bookmarks, you currently have to click the "Create Bookmark" button to make a new one; it doesn't update existing ones but I can add that to the to-do list. When you mention that the long URL (should be 0xa.click/...) links to this site, do you mean to this add-on page? I'm not getting that behavior on my machine but I'd be very curious to hear what's happening on yours so I can fix it.