Solution: click something again.

Can you attach a screenshot?

• https://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem
• use a compressed image type like PNG or JPG to save the screenshot

See also:

• https://support.mozilla.org/en-US/kb/use-firefox-sidebar-access-bookmarks-history-synced

"Ctrl+B" is the keyboard shortcut to toggle the Bookmarks Sidebar. "Ctrl+Shift+B" is the keyboard shortcut to toggle the Bookmarks Toolbar. "Ctrl+Shift+O" is the keyboard shortcut to Open the Library.

1. i know how to take a screen shot 2. unfortunately, the problem is gone. I was so disgusted with the update to Video Downloadhelper that was just added that I had to restore my Win10 back a week and restore the old addons file for Video Downloadhelper from a backup (to revert to older version).

The problem was a vertical toolbar (that is a vertical space filled with just icons) that appeared on the very left of my window. It was obviously not a bookmarks "sidebar", but not sure what it was. I remember one of the icons was a "settings" (cog wheel) icon. I have a VAGUE suspicion it was created by an addon, maybe even Video Downloadhelper. Step 2 above got rid of this vertical toolbar.

Anyone have an idea what I might have been? I know one thing: I am not going to allow Video Downloadhelper to update and see if that is the problem! The newest version doesn't work!!! It does not create an icon to activate it!