Firefox as Default Browser
You might have accidentally changed the default browser of your PC and you want to change it back to Firefox then this is really easy process. And if you are searching to change your Default browser in Windows 7 then you are in right place.
For this first you will need to go to Firefox browser and then open the browser.
Click in Tools and then options, then you will get a popup windows for options. Click in Advance tab then you will get list of setting.
There you will see, Always check to see if the Firefox is default browser on startup and in its side, it says check now.
Click Check now and then message asks for Firefox to make it a default browser, then click on yes.
This will work so Enjoy.