Safari To allow pop-ups with Safari 1. From the Safari gear menu, click Preferences. 2. Select the Security button. 3. Click to de-select Block pop-up windows. 4. Click Close. Note: This will allow pop-ups on all other sites as well. Safari doesn’t have a way to select exactly which sites to allow pop-ups on and which sites to disallow. This can easily be turned on and off by selecting Ctrl-Shift K (or Apple Shift K) on your keyboard whenever you need to turn it on or off.