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Fix unexpected installation error 203 in Firefox

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Firefox is a wonderful browser. So that many people would like to install it on their computer. While during installation, some users may get some errors. Such as, when you try to install some Add-ons there an error message pop up and stop your installation. Is it quite annoying.

Error messages: "Firefox could not install the file because: Unexpected installation error -203".

The firefox error 203 is a common problem for all Firefox users when we try to install extensions on the browser. This is a Firefox error message that may indicate your extension files have been damaged. Following steps tell you how to fix unexpected installation error 203 in Firefox:

Step 1: From the menu at the top of the Firefox windowbar, select FileFirefox and then select the ExitQuit FirefoxQuit menu item.

Step 2: Go to your profile folder.

Step 3: Delete the following files:

  • extensions.ini
  • extensions.cache
  • extensions.rdf
Step 4: Restart Firefox.

Once you have done all the steps above mentioned, you have overcome the unexpected installation error 203 in firefox. While if you are tired of firefox, you can have Internet Explorer 8 a try. And if you get some problems about IE8, you can go to Windows Registry to get solution.


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