AFAIK it is not possible to get access to only the URL. I think the "tabs" permission triggers the "Access your data for all websites" warning. The "tabs" permission is required to get a tabs URL and change it.

Discussion about ClearURLs permissions: https://gitlab.com/KevinRoebert/ClearUrls/-/issues/159

Extension permissions: https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/Web...