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How to turn off a split screen showing 2 tabs and getting back to a single webpage look.

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I have two tabs open in a split screen when I first open firefox. When I close one of the tabs my screen is still split.

I have two tabs open in a split screen when I first open firefox. When I close one of the tabs my screen is still split.

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You may be opening one of the pages in the sidebar.

Opening in the side bar is the default for bookmarks that are created via a link or button on a website.
You can check the Properties of a bookmark via the right-click context menu in the side bar (Ctrl+B; Cmd+B on Mac).
In the Bookmarks Manager (Bookmarks > Show All Bookmarks) you can click the More button in the Details pane at the bottom right.
Make sure that "Load this bookmark in the side bar" is not selected.