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I have recently backed up the Firefox using MozBackup and restored it onto another profile. After the upgrade process, none of the add-ons are working and also wasn’t able to install any new extensions. It was failed because of firefox error code 203.

I did some research on firefox knowledge base and found this happens after a software update because of some corrupt extension files. Deleting them can fix a number of extension issues; they will be regenerated the next time you start Firefox.

• Exit Firefox completely
• Open your Firefox profile folder as mentioned below on different OS.
• Windows Vista and Windows 7 – %APPDATA%\Mozilla\Firefox\Profiles
• Windows 2000 and Windows XP – C:\Documents and Settings\<Windows login/user name>\Application Data\Mozilla\Firefox\Profiles\<profile folder>
• Linux and Unix – ~/.mozilla/firefox/<profile folder>
• MAC – ~/Library/Mozilla/Firefox/Profiles/<profile folder>  or ~/Library/Application Support/Firefox/Profiles/<profile folder>
• Delete below three files or rename them.
• extensions.ini
• extensions.cache
• extensions.rdf

And reopen your Firefox and the add on issue would have been resolved.

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