The latest Clipper release (v0.4.0) may stop working once you refreshed the API Token in Joplin Application Settings.

Re-installing the clipper will not fix it as the outdated token is still stored via this Apple utility: UserDefaults | Apple Developer Documentation

To update the token execute this from the command line:

defaults write com.cweirup.Joplin-Clipper-Extension apiToken <new token>