Hi,
I made some research on same but I am afraid it end up on reinstalling Mozilla Firefox.
try performing a Clean reinstall. This means you remove your Firefox program files and then reinstall Firefox. This process does not remove your Firefox profile data (such as bookmarks and passwords), since that information is stored in a different location.
To do a clean reinstall of Firefox, please follow these steps: Note: You might want to print these steps or view them in another browser.
Download the latest Desktop version of Firefox from mozilla.org (or choose the download for your operating system and language from this page) and save the setup file to your computer.
After the download finishes, close all Firefox windows (or open the Firefox menu and click the close button ).
Delete the Firefox installation folder, which is located in one of these locations, by default:
Windows:
C:\Program Files\Mozilla Firefox
C:\Program Files (x86)\Mozilla Firefox
Mac: Delete Firefox from the Applications folder.
Linux: 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.
Now, go ahead and reinstall Firefox:
Double-click the downloaded installation file and go through the steps of the installation wizard.
Once the wizard is finished, choose to directly open Firefox after clicking the Finish button.
More information about reinstalling Firefox can be found on https://support.mozilla.org/en-US/kb/troubleshoot-and-diagnose-firefox-problems#w_5-reinstall-firefox.
WARNING: Do not use a third party uninstaller to uninstall Mozilla Firefox.
Regards,
JorgeAV
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Nothing works unless you do the work!!!