I would love the ability to pin tabs on my Android. I have a number of tabs always open (news, weather, etc), and then I open all interesting items in new tabs. When done, I close those extra tabs, but often I close one of the "important" tabs by accident. If I could pin them, so that I would have to unpin them before closing, this would not happen. Even better if there was an option to close all unpinned tabs.