Luckily, I found one solution that worked from Firefox forums. If you are facing same problem, try the technique below. It might be of help to you because it worked for me.
In your firefox browser type about:config
It will ask are you sure that you are going to be careful.
Select "Yes"
In the filter bar type "fileserve"
For all of the results that it shows Right click and select "reset"
This will take your system back to normal.










