I am the developer of a browser extension Pulsarr that originally allowed users to add movies to Radarr by clicking a button when browsing IMDB. I have recently added support for Sonarr to Chrome that will will allow you to do the same from IMDB or TVDB. I would love for you to try it out and please raise any issues to Pulsarr on Github.
https://chrome.google.com/webstore/detail/pulsarr/dcildkalkckjjdfpgagmnbbfooogopkd