Let’s be honest: there are a handful of sites that you visit a lot, open in tabs in Safari.
If you want to keep these tabs ready to go in every Safari window you open, even after you’ve quit Safari and re-launched it, you can use El Capitan’s new tab pinning feature to keep pages “open, up to date, and easily accessible.”
The sites you pin will stay active in the background, pinned to the left side of your tab bar. Here’s how to create (and get rid of) pinned tabs in Safari.



