I have a lot of tabs open. When I open a new tab in Firefox for Android, the new tab is appended at the end of my list of tabs. I have to scroll all the way to the bottom to switch between my most recently used tabs.
I think an option to reverse the order of tabs on mobile Firefox would be a good feature. For example, I'd like my most recently opened tabs to be the first tabs I see when I open the tab navigation pane on Firefox, and my older tabs to be the last ones in the list.