I started to have this issue all of a sudden following a browser update recently. I still don’t know what triggered it specifically, but how I resolved this issue was by going into extension manager (shown in the screenshot below), then turning it off and on again, also did the same with one of the toggles (like Allow in Incognito and Allow access to file URLs). You’ll need to enter your master password again afterwards to enable the extension, but that solve the issue right away. I’m guessing it basically did a reset to the extension and cleared whatever obstacle there was. Hope this helps.
