For vertical tabs (I'm sure for horizontal as well), right-click context menu does not have a menu item for close tab. The X for close might be harder to target, or you might have right clicked and then realize you want to close (as I just did, prompting this). You shouldn't have to click away than target the X.
Bookmark Tab should definitely be the first item, as it is now. I guess Close Tab should be in the last group, with the other Close functions.