I am running firefox 23.0.1. I just upgraded to evernote 5.0+. When I try to add webclipper 5.7 to firefox I get the error Firefox can not modify the neede

I am running firefox 23.0.1. I just upgraded to evernote 5.0+.
When I try to add webclipper 5.7 to firefox I get the error
Firefox can not modify the needed file
I could not locate the files referenced in the answers presented.

Firefox no longer unpacks an extension automatically, but renames the XPI file to the ID of the extension and copies that file to the extensions folder in the Firefox Profile Folder.
If an extension needs to be unpacked then there should be an unpack directive (<nowiki><em:unpack>true</em:unpack></nowiki>) in the install.rdf file of that extension.
* https://developer.mozilla.org/En/Updating_extensions_for_Firefox_4.0#XPI_unpacking
You can try to set the extensions.alwaysUnpack pref to true on the about:config page.
*http://kb.mozillazine.org/about:config

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