Hi Douala, I'm not sure what is going wrong. Usually there's some kind of error dialog.

If you try again right away, does Firefox say it is running and needs to be closed first, or does it behave like it's not running?

Could you try starting Firefox in its Safe Mode? Hold down the Shift-key when double-clicking the Firefox shortcut. Does that let you bring up Firefox?

Perhaps you're encountering this issue:

A Recent Issue for 64-bit Windows Users with 64-bit Firefox

Before Firefox 56.0.1, users of 64-bit Windows generally were using the traditional 32-bit version of Firefox. However, newer versions may switch you to the 64-bit version.

We received a number of puzzling reports of Firefox either not starting -- the way you described -- or not loading any pages after this migration.

One user discovered that Windows was silently killing Firefox at startup and recording it in the Windows event logs (you can view event logs using the Event Viewer). Based on one of the reports in the log, we were able to trace that to an out-of-date Logitech camera driver, of all things.

By now at least six other users reported that uninstalling or updating the Logitech camera software resolved their problem as well.

• https://support.mozilla.org/questions/1179822#answer-1019375
• https://support.mozilla.org/questions/1181740#answer-1021470
• https://support.mozilla.org/questions/1181405#answer-1022798
• https://support.mozilla.org/questions/1182572#answer-1023413
• https://support.mozilla.org/questions/1182847#answer-1024290
• With 57: https://support.mozilla.org/questions/1188971
• https://support.mozilla.org/questions/1191368#answer-1041814

Do you want some assistance in looking at event logs, or do you have such a webcam?

If the investigation doesn't yield any solutions, it is worth trying a return to 32-bit Firefox.

While normally this kind of change is seamless -- the installer detects your existing data and preserves everything -- you might want to make a backup "just in case."

• Back up and restore information in Firefox profiles
• How to opt out of 32-bit Firefox migration to 64-bit

Note: If you decide to try 64-bit Firefox on the same system at some point in the future, see: How to switch from 32-bit to 64-bit Firefox.

If the above does not help,

Let’s do a full clean re-install;

Download Firefox For All languages And Systems {web link}

Save the file. Then Close Firefox.

Using your file browser, open the Programs Folder on your computer.

Windows: C:\Program Files C:\Program Files (x86)

Mac: Open the "Applications" folder. https://support.mozilla.org/en-US/kb/how-download-and-install-firefox-mac

Linux: Check your user manual. If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it. See Install Firefox on Linux; https://support.mozilla.org/en-US/kb/install-firefox-linux

If you downloaded and installed the binary package from the Firefox download page, simply remove the folder Firefox in your home directory. http://www.mozilla.org/firefox#desktop ++++++++++++++++++++++++++++ Do Not remove the profiles folder.

Look for, and rename any Mozilla or Firefox program folders by adding .old to them. Do not rename the Mozilla Thunderbird folder if there is one.

After rebooting the computer, run a registry scanner if you have one. Then run the installer. If all goes well, remove the OLD folders when you are done. +++++++++++++++++++++++++++ If there is a problem, start your Computer in safe mode and try again.

http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode This shows how to Start all Computers in Safe Mode; Free Online Encyclopedia

Douala said

This morning when as soon as my FF browser came up my computer screen froze. Had to manually shut doe the computer via the off button. When I restarted the computer I could never get my FF browser to come up after clicking the shortcut icon on my screen.

Thank you to everyone for your help. I cannot express how grateful I am. G-d Bless You All !

Glad to help. Safe Surfing.