Thank you for the review! Due to some changes indeed stuff seems to have broken/no longer work. In addition, after some breaking changes FF side I proceeded with a different tab loading workflow to try and address some other issues. If you have other questions or would like to troubleshoot please email me. Though, do note, some URLs should never have worked. Please confirm whether the URL refers to one of these blocked formats:

https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/Tabs/create#url