1. Using Firefox, open http://extensions.gnome.org. Search for and open "Dash to Dock".
2. Install the suggested browser extension for GNOME shell.
3. Click "Continue to Installation".
4. Click "Add".
5. Click "Refresh" or press Ctrl-R.
6. Click the On/Off switch to the right.
7. Click Install.
8. Close Firefox. The dock should now stay visible at all times, except when an application is in fullscreen mode.
