Hi, Is it [https://addons.mozilla.org/en-US/firefox/addon/nasa-night-launch/ NASA Night Launch]? You can try checking for updates to Firefox via the distribution's software manager / update manager. If problems persist you can reset Firefox and start afresh with Night Launch. The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. Note: ''This will cause you to lose any Extensions, Open websites, and some Preferences.'' To Reset Firefox do the following: #Go to Firefox > Help > Troubleshooting Information. #Click the "Reset Firefox" button. #Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish. #Firefox will open with all factory defaults applied. Further information can be found in the [[Reset Firefox – easily fix most problems]] article. Did this fix your problems? Please report back to us! If you would like to take a listing of the add-ons, changed preferences/settings etc. to quickly replicate the previous profile, please '''Copy all to clipboard''' (on the left of the reset button), and paste it into MS Office Excel, or OpenOffice/LibreOffice Calc, or notepad. However, it would be a good idea to check for the existence of the issue immediately after the reset.

solved! Now have night launch up and running. Thanks for yourhelp