[ruuk]

This addon would be great to open authorization URLs. I have a rather complicated toolchain right now to enable dropbox support for my addon service.watchedlist.
With the webviewer, I could do the whole process from within Kodi.
I tried your addon, but the authentification web site does not seem to have forms in the web viewer. Am I missing something or is the page just "too complicated" to be displayed in a quite simple browser?

 While this is one of the reasons I created the add-on, in practice it turned out that it was prone to issues and not very user friendly.
I did try the page you linked above. It did seem to detect forms on the page, but didn't show them as editable. Likely the forms have non-standard controls, or they are added in with javascript (I didn't check) and in either case WebViewer can't handle those.