Then be sure to check that 1Password_rCURRENT.log mentioned in the thread, as it may provide at least more debugging info about why they're angry; that's how I found out how to fix my Firefox install (albeit not on macOS)

    $ mdfind 1Password_rCURRENT.log
    /Users/mdaniel/Library/Group Containers/2BUA8C4S2C.com.1password/Library/Application Support/1Password/Data/logs/BrowserSupport/1Password_rCURRENT.log