What is your computer system and Firefox?
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.
If you downloaded and installed the binary package
from the Firefox download page, simply remove the folder
Firefox in your home directory.
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.
After rebooting the computer, run a registry scanner. 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.
Starting The Computer In Safe Mode;
Free Online Encyclopedia
What is your computer system and Firefox?
Let’s do a full clean re-install;
'''[http://www.mozilla.org/en-US/firefox/all/ 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.<br>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 [https://support.mozilla.org/en-US/kb/install-firefox-linux Firefox on Linux].
If you downloaded and installed the binary package
from the [http://www.mozilla.org/firefox#desktop Firefox download page,] simply remove the folder
Firefox in your home directory.
'''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.
After rebooting the computer, run a registry scanner. 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 Starting The Computer In Safe Mode;<br>Free Online Encyclopedia]'''
