Firefox Solutions
Disable proxy settings
Click the three lines under the X
Click Options
Under Network Settings at the bottom of the list click Settings
Make sure No proxy is selected and click OK
Reload browser
Disable browser extensions
Click the three lines under the X
Click Options
Click Extensions & Themes
Click the blue slider on each extension you wish to disable
Reload browser
Clear cache
Open Firefox
Click the three lines below the X
Click Options
Click Privacy & Security
Click Clear Data
Verify that Cached Web content, Cookies and Site Data are selected
Click Clear
Close and reopen browser
Reset browser settings to default
Open Firefox
Click the three lines in the upper right corner below the X
Click Help and Choose More Troubleshooting Information
Click Refresh Firefox button under the Give Firefox a tune up
Read the warning and click Refresh Firefox