Firefox automatically opens 15 tabs, which I cannot close. I have uninstalled Firefox, and reinstalled, with the same problem reoccuring

The tabs are all showing the Firefox home page. Changing to another web page, and attempting to close the tab, generates another new tab, showing the Firefox help page

Opening in the sidebar is the default for bookmarks that are created via a link or button on a website.<br />
You can check the Properties of a bookmark via the right-click context menu in the sidebar (Ctrl+B; Cmd+B on Mac).<br />
In the Bookmarks Manager (Bookmarks > Show All Bookmarks) you can click the More button in the Details pane at the bottom right.<br />
Make sure that "Load this bookmark in the sidebar" is not selected.
Does it help if you open other content like the bookmarks (Ctrl+B) in the sidebar and close the sidebar via the close X?
You can also check for problems with the localstore.rdf file.
*http://kb.mozillazine.org/Corrupt_localstore.rdf

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