When you right click buttons in the top bar, they usually bring up the context menu you get when you right click a link. In the editor, though, right clicking these bring up the context menus for clicking an image/text, when they should be bringing up link context menus. I don't have any extensions installed, and this happens on every project in the editor.

I have a few examples using the “Scratch” logo button:

• On the front page (scratch.mit.edu):
  
  
• On the “My Stuff” page: (scratch.mit.edu/mystuff/):
  
  
• On a project page (scratch.mit.edu/projects/615446078/):
  
  
• In the editor for that same project (scratch.mit.edu/projects/615446078/editor/):
  

It handles the links differently. I don't know why, but it does.