Also, when I was experiencing my problem before, I had some extension names appearing in the general right-click menu on web pages, but they were just context menus for those specific extensions and would not launch anything. When I was re-enabling the extensions after Step 4, one extension's icon did not appear on the address bar. I finally found it in this right-click menu, and I could launch the extension from there. However the other extension names that had been in the right-click menu all along still would not launch anything.