If there are certain websites that you have open pretty much all the time, you can save yourself the bother of having to type in the web address or reload them when they've been closed. By right-clicking on a tab you can choose to pin it to the browser.
The size of the tab will be reduced and it will be moved to the far left of the tabs that you have open. The option to close the tab will be removed and it will be reopened even if you restart the browser. You can right click again to unpin a tab.