This is a small restartless add-on for Firefox to view your Sync Key at about:synckey. Useful when you only have your mobile device running Firefox Mobile at hand and you would like to connect to your Sync account.
1. Install this add-on. It's restartless, so no restart required.
2. Open a new tab and go to about:synckey. Enter the Sync Key into your other device.
3. When you're done, you probably want to uninstall the add-on again to prevent easy access to your Sync Key.
You may also want to consider protecting your Firefox data on your phone using a Master Password with the Master Password add-on for Firefox Mobile