I do not know where to post feedback and the feedback link is down so if someone can get this to the Firefox development team, it would be a great help:

1. Feedback is important and to give it a user has to search this website and come here to write it. The help should be in the drop-down menu or menu items where a user can write to development team. This is in Google Chrome. Can be implemented in Firefox. 2. I never understood why title bar and the address bar are separate. They can be merged. The mass horizontal space in title bar is unused forever. Please implement this. 3. The auto-hide/intel-hide of address-bar and title-bar option is not available to the user. Please make it available. This is available for bookmark though and it is working well. 4. If given a chance the user will not want to see the address in the address bar. Most users have utility of copying the address, not much. Can the address be hidden when user do not want to see it? 5. Modern phones have camera not on the top-left edge nowadays, but in top-center. Similarly the tab should open in the center. The minimum development team could do is to provide user with this option that he only can move it to center. Very good improvement this would be. 6. Word-wise feature of Amazon Kindle + Hard-word meaning show on mouse hover features requested. Few extensions available which are not very good in quality and these features should be default. This will save users time to search for new words, will reduce internet traffic. 7. When I save a dark theme in Nightly using customize option. It stays for few seconds and then reverts back to white theme. This could be a bug. Please investigate it. Thanks.