Hi,
Thanks for using Owl for such a long time. I imagine you are one of the first few users when I initially published this extension. The WebExtensions API has certainly brought some changes has caused a few thing to break here and there. First, the Owl panel had to be moved to the URL bar since the new API doesn't allow both drop-down and clickable add-on buttons. I tried to find a way to bring back the old interface but couldn't. As for the settings being ignored issue, does refreshing the webpage help? It is observed that Owl fails in first attempt but works when the page refreshes. I'm currently working to fix this. In case you find any more issues or would like to make more suggestions, please feel free to get in touch at owl@sidhant.io or open an issue on Github (https://github.com/CptFoobar/Owl/issues).