• Right click on the tab and use option undo close tab for restre the previous browsing session.

• use crtl + h to see the history
• use ctrl + b to restore the bookmarks.

• Press F11 key to switch the browsing mode to Full screen

That helped some. Still getting split screen viewing. How do I get full screen view each time I go to new site? I chose xfinity as home site, but getting last window from previous session every time I get back on computer. How do I get home site each time I get on computer. Thanks.

• You can toggle the Bookmarks sidebar off/on via "View > Sidebar > Bookmarks" or "Ctrl+B" (Command+B on Mac)
• You can toggle the History sidebar off/on via "View > Sidebar > History" or "Ctrl+H" (Command+H on Mac)

There is a star like button to the right end of the search bar on the Navigation Toolbar to bookmark the current web page and a "Show your bookmarks" button next to it to open the Bookmarks in a drop down menu.

You can also still have the menu bar visible via the right-click context menu on the toolbars to have the bookmarks menu.

See also:

• https://support.mozilla.org/kb/common-questions-after-updating-to-new-firefox

• https://support.mozilla.org/kb/learn-more-about-the-design-of-new-firefox
• https://support.mozilla.org/kb/how-to-make-new-firefox-look-like-old-firefox