I have the problem that raindrop extension works fine on all my PC's (Win-7 / Win-10) but it disapears on Crome on my Mac. Google Chrome is up to date

Version 83.0.4103.106 (Official Build) (64-bit)

Mac: macOS Catalina Version 10.15.5.

Deactivating / Reactivating and Removing/Installing did not solve issue. It pops up shortly while starting remove, and disappears if I cancel Remove... :-I

Safari only "Browse Bookmarks" extension worked .. But this is fine, as I do not often use Safari!

Do you have a solution for Chrome?

Thanks in advance