It’s been flagged ("Receiving end does not exist" - v7.0.9) and also acknowledged as a bug (Ui.Vision RPA Chrome extension: Migration from Manifest V2 to Manifest V3 [Completed 😃] - #51 by admin).
Best thing you can do in the meantime is either watch over it and restart each time it fails (painful), or try and rollback to v.6.2.8 (which I’m still struggling to do due to lack of help, cough cough).
To rollback see the first post at Ui.Vision RPA Chrome extension: Migration from Manifest V2 to Manifest V3 [Completed 😃] - it provides a link to v.6.2.8