Mozilla Firefox Right click doesnt work!!

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Hey guys I'm facing a problem in Mozilla Firefox from many days. Whenever I right click in firefox, it doesn't show any menu. Actually after few days I realised that the menu is there but it is invisible. Also the options like file,view,tools these also don't work, means they also appear invisible. I tried to search google for this but it didn't help. The right click works in other places like windows explorer. I have the latest version of firefox. The problem was once solved when I started laptop in safe mode and used firefox but then again this problem has started. Help me out guys.