A particular Web site tab always opens in the left sidebar

When I click on bookmark LSC icon in my toolbar, this site opens in the sidebar on the left of my computer screen. This sidebar WILL NOT CLOSE when I try to access any other Web site. It's really annoying.

This is a new problem and has just started today. 14/09/2015. I added a screenshot of this annoying problem. Hope you can help me.

Opening in the sidebar is the default value for the bookmarks created via a link or a button on a Web site.
You can view the properties of a bookmark using the context menu in the side bar (Ctrl + B; Command + B on Mac).
In the Bookmark Manager (Bookmarks > show all bookmarks) you can click on the button more in the lower details pane on the right.
Make sure "Load this bookmark in the sidebar" is not selected.

Tags: Firefox

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