What do I do when I see "about sessionrestore" in the URL field ?
Even when I uninstall Firefox and reinstall a newer version, the problem still occurs. When I click on Firefox icon, its page seems to open but the "about sessionrestore" reappears. If I click on the same field to write another URL, then Firefox stops responding
Uninstalling and re-installing Firefox does not by default remove the profile folder (location where user data is stored), another troubleshooting option is to create a new profile. Creating a new profile will show if the problem is with the old profile. For how to do that see creating a new Firefox profile on Windows.
If the new profile works, you can copy selected data such as bookmarks and passwords to the new profile. For details see transferring data to a new profile. Do not copy the preferences file, and it is best to re-install any add-ons.