Hello, I Created a few weeks ago a custom theme for my own personal use (Not uploaded to WEB). I exported it from Firefox myself and fully tested that it could be loaded as is custom when I create something. Unfortunately I had a system crash and have had to reinstall software & apps including FireFox. I am using exactly the same version of firefox as before and all the same identical plug-ins. I know on some ocassions issues can be caused with different versions of the same software. There for I have made completly sure that I have installed all same versions as before. I always get error when trying to load my theme. I know the file is not corrupted as I mentioned I had tested it. The error that is displayed is as follow. about:addons This add-on could not be installed because it appears to be corrupt. As I mentioned above I know the file is not corrupt. Can someone please help as I would like to do this locally not via the WEB or Firefox addon's site.