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Why does a bookmarked site open on the left side of the screen?

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When I click on a bookmark to open a site using Firefox, the site opens on the left third of the screen instead of opening on the entire screen. This only occurs when I use Firefox. When I use Safari, the bookmarked site opens on the entire screen. How can I remedy this in Firefox?

When I click on a bookmark to open a site using Firefox, the site opens on the left third of the screen instead of opening on the entire screen. This only occurs when I use Firefox. When I use Safari, the bookmarked site opens on the entire screen. How can I remedy this in Firefox?

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Check the Properties of the bookmark to see whether the "Load this bookmark in the sidebar" box is checked. If the bookmark was created by the site (e.g., clicking a link or button in the site), this is a common problem because for security reasons, it is not possible for sites to create normal bookmarks.

To check a bookmark's properties, you can right-click it and choose Properties. Or you can highlight it in the Library dialog (Bookmarks > Show All Bookmarks) and expand the pane on the lower right by clicking the More button.