To enable cookies in Firefox please follow these simple instructions.
Click on the “Cog” icon appearing in the right corner of the browser window and choose “Preferences”.
A new window should have appeared. At the top of this new window click on the padlock icon called Security.
Half way down the window you should see a label called “Accept cookies:”. Change this to either “Always” or to “Only from sites I visit”.
Changes are automatically saved so you can click the red “x” icon at the top which will close the window. And that’s it - the cookies should now be working.