I open a new tab, and click on the bookmark in the bookmark toolbar, and the web site opens in a side bar. I want it to open in the full tabbed window.

You can edit the properties of that bookmark to fix this. If you right-click it and choose Properties, you will check a checkbox toward the bottom of the dialog that opens the bookmark in the sidebar. Uncheck that and click Save. Does it work? (When you use a link on a website to store a bookmark, they get added this way. You can use Ctrl+d or the "star" in the location bar to add the bookmark without having it open in the sidebar.)