Even without `active` and `currentWindow` parameters the extension cannot get urls and titles from other tabs because it has only the `activeTab`[1] permission declared in the manifest. You need more powerful permission for that.
I think with the `activeTab` permission you still get the an object for every tab other the active one, but without access to `url`, `title` and `faviconUrl` properties.
Thanks for checking out anyway. I built this tool especially because all of the others already available were a privacy nightmare.
[1]: https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/Web...