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READ THIS CAREFULLY BEFORE PROCEEDING
In case you're dumb: this ONLY works on FW 7.50/7.55. If you are on a lower firmware, download a 7.55 retail update file here and update your system. If you are on 7.02, click here. If you are on 6.72, click here. If you are on an even higher firmware (e.g. 8.03), your console CAN'T BE HACKED yet.

1.    Click on the link that says JB+MIRA or JB+HEN, depending on your personal habits. In about 20 seconds you'll get an alert saying "You're all set!", followed by "There is not enough free system memory". This means that everything has gone well. Note: if using Mira, the screen will go dark for a dozen of seconds.
If something went wrong during the process, you may get an alert saying "Jailbreak failed! Reboot your PS4 and try again.". In this case you must reboot your PS4, preferrably without closing the dialog box.
If the system hangs for more than a minute (may require more time on slow Internet connections), reboot your PS4 and try again.
If the system crashes (looks like instant powerdown), press the power button on the PS4 (NOT on the gamepad) until it turns on again, then retry.
2.    If you get a "There is not enough free system memory" message without any pop-ups, then it means that the webkit exploit has failed. Click OK and retry. This error is not going to harm your console. Success rate here is about 10%, so don't worry.
For advanced users: To load your own payloads using NetCat, run JB+NETCAT and send the payload to TCP port 9021 (9020 for the legacy version).
This exploit does crash and hang. Sometimes you even have to retry 10 times to get the jailbreak.

Credits: Synacktiv team for the WebKit exploit, @theflow0 for the kernel exploit.

JB+MIRA FTP JB+NETCAT (LEGACY)