To change the cookie setting Go to the Firefox panel its on the far right last button. Go to options, and then go to privacy and make sure it says Firefox will: Remember history If this still doesnt work I would recommend resetting firefox. The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. <br> '''Note''': ''This will cause you to lose any Extensions and some Preferences.'' *Open websites will not be saved in Firefox versions lower than 25. To Reset Firefox do the following: '''For Firefox versions previous to 29.0:''' #Go to Firefox > Help > Troubleshooting Information. #Click the "Reset Firefox"[[Image:Button reset]] 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. '''For Firefox 29.0 and above:''' #Click the menu button [[Image:New Fx Menu]], click help [[Image:Help-29]] and select ''Troubleshooting Information''. Now, a new tab containing your troubleshooting information should open. #At the top right corner of the page, you should see a button that says "Reset Firefox"[[Image:Button reset]]. Click on it. #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! Thank you.

Many thanks for your suggestions. The second option of resetting Firefox seems to have done the trick.