Sorry, The application works slowly, especially when switching between tabs and Panorama Tab Groups. This poor performance is since the fresh installation of this extension. It should be definitely improved. I use FF Quantum 65.0.1 (64-bit) Portable version.
Sorry to hear that, you should try our latest version 0.8.9. a lot of work was done by arasuki (https://github.com/projectdelphai/panorama-tab-groups/pull/101) and you should see huge improvements. Stick with us and we'll always try and make it better!
