Hey @mp1982 !
It depends a bit what you mean by "verified".
If you are looking to get your extension signed so it can be installed on Firefox, you can follow this guide: https://extensionworkshop.com/documentation/publish/#get-your-extension-signed. Basically you want to head over to https://addons.mozilla.org, sign in and upload your extension. During that process, you can select whether you want to distribute your add-on through addons.mozilla.org or through self-distribution.
If you already have an extension and you are interested in it being part of our Recommended program, there's more information about that here https://extensionworkshop.com/documentation/publish/recommended-extensions/.