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open second tab first tab stays open with split screen

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when I open a second tab from bookmarks, my first tab stays visible so I end up with a split screen. Don't want this, want each tab to be full screen. can't figure out what's going on here.

when I open a second tab from bookmarks, my first tab stays visible so I end up with a split screen. Don't want this, want each tab to be full screen. can't figure out what's going on here.

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Right-click that bookmark and select Properties, then un-check the preference for Load this bookmark in the sidebar, and then click Save.

Using JavaScript buttons on web pages for "Bookmark this Page" causes that preference to be selected when saving the bookmark in that manner. So, don't use those buttons, use the "Bookmark this Page" feature that is built into Firefox instead.