After reopening the last session when I reopened Safari 9.1.1 (10601.6.17) on a MacBook Pro laptop running OS X Yosemite (10.10.5), I found that, though the icon for Evernote was appearing the the left of the address bar, clicking on it did not bring up the Evernote window that would allow me to save webpages, though I had installed Evernote previously.
I had closed and reopened Safari after it stopped responding to any keyboard entries or mouse movement.
When I clicked on Safari from Safari's menu bar and chose Preferences and then clicked on Extensions, no extensions were shown. I noticed that the Develop option was not appearing in the Safari menu bar, though I had enabled the Develop menu. So I re-enabled the Develop menu by clicking on Safari from the Safari menu bar, selecting Preferences, then clicking on Advanced and then checking the check box next to "Show Develop menu in menu bar". I then clicked on Develop from the menu bar when that option reappeared. I then selected Disable Extensions. I then clicked on Develop again and again selected Disable Extensions, which this time removed the check mark next to that option.
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