How to view your Firefox bookmarks in a tab
There are many great add-ons for Firefox (the open-source web browser from Mozilla), some of which allow you to open your bookmarks in a formatted tab. Both Bookmarks Tab and MyBookmarks do this, but if you want something even simpler, copy and paste the following line into Firefox's address bar.
Easy! If you want to be even craftier, you can bookmark the address, right click, choose "Properties", check the box that says "Load this bookmark in the sidebar" and click "Save". You now have a bookmark that will open all your bookmarks as normal when you left-click, or open in them in a new tab when you Ctrl+click or middle-click, just like opening a normal tab window.