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Your server should serve OpenSearch plugins using the MIME type application/opensearchdescription+xml. Be sure that your Search Plugin XML is well formed. You can check by loading the file directly into Firefox. Ampersands in the template URL need to be escaped with & and tags need to be closed with a trailing slash or matching end tag. The xmlns attribute is important, without it you could get an error message indicating that "Firefox could not download the search plugin from: (URL)". Note that you must include a text/html URL — search plugins including only Atom or RSS URL types (which is valid, but Firefox doesn't support) will also generate the "could not download the search plugin" error. Remotely fetched favicons must not be larger than 10KB

Once you have a key you need to add its public part to your add-on's install.rdf file. The simplest way to do this is to select the key then click the Install toolbar button. You must then locate your install.rdf for McCoy and the public part of the key will be added directly to the file. The file will be overwritten so take a backup if you need to.

You need to use McCoy to sign this file so that the application can verify that it really came from you. Simply select the key you originally added to the add-on's install.rdf, then click the "Sign" toolbar button, select your update.rdf file and the data in it will be signed. It's important to note that if you change any information in the update file then it must be signed again.