Gadget export
From Jenny Everywhere Wiki
To export the BlurImages-styles gadget, click on "Download" button, save the downloaded file, go to Special:Import on destination wiki and upload it. Then add the following to MediaWiki:Gadgets-definition page:
* BlurImages-styles [ResourceLoader|type=styles|supportsUrlLoad=true|hidden] | BlurImages.css
You must have appropriate permissions on destination wiki (including the right to edit system messages) and import from file uploads must be enabled.