Bug - not closed Vivaldi
- Try download 1 or more big files (time for download 2-4 minutes for make all tests)
- Close Vivaldi
- Run Vivaldi
- Look Vivaldi downloads - see a continued download file(s) process
- Wait of end downloads and close vivaldi
- Look process - vivaldi DON'T closed..... After terminate processes - get errors of addons
Yes that problem is a known old bug.
Maybe the following helps you
- untick the box "Continue running background apps when Vivaldi is closed"
- restart vivaldi