By default Safari will open links from your emails or your downloads in a new window and this can be really annoying when working with dozen of links, you'll be rapidly submerged by a lot of Safari browser windows.
You can configure Safari to open these new links in new tabs,it's more manageable.
- Click on the "Edit Menu" > Preferences > General tab.
- Down in the list, next to "Open links from application", check the "in a new tab in the current window" option.
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