Step 1 - Select the Menu Button on in the top right corner (3 lines)
Step 2 - In the menu, on the lower right, press the Help Menu Button ( ? Question Mark)
Step 3 - From the Help Menu, Select Troubleshooting Information
Step 4 - On the Troubleshooting Information page, select Refresh Firefox...
Step 5 - Select Refresh Firefox
***NOTE - This will also remove any installed firefox addons. You will have to add those back again if you use them.
Step 6 - Close Firefox - When you re-open it, it will be reset back to default settings.
DONE - Firefox is reset to Default Settings
To reset another browser, CLICK HERE: