Now in 5.7 beta, tabs have icons on them. Editors have a notepad icon, viewers have a magnifier icon and so on. I suggest that you omit the words "Editor ..." or "Viewer ..." from the tabs to save screen real estate. The user can already tell if the tab is an editor or a viewer by looking at the icon. However for the tabs that are less frequently used (e.g. Data diff viewer) you should keep the name.
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The idea was posted1 year ago