What causes the Xulrunner Error to appear?
Here is what causes this error
Note
The solution given below is for the Mozilla Firefox. However, as mentioned in the beginning of the article, this problem can occur for the Mozilla Thunderbird users as well. The reason for seeing this error when trying to open Thunderbird is the same as Mozilla Firefox. So, the solution given below will work for Mozilla Thunderbird as well. You just have to reinstall the Mozilla Thunderbird instead of Mozilla Firefox but the other steps should be same.
Method: Clean Install Firefox
Since the problem is caused by an incomplete update installation, the usual solution is to perform a clean install of the program. This means that you have to uninstall the program and get rid of all of its files so there’s nothing left on the system that might interfere with the new installation. You can then install a fresh copy of the program and that generally solves the problem. So, follow the steps given below to perform a clean install of Firefox. Install the latest version of Firefox by running the downloaded file and everything should be fine.
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