Hi, I just want to keep it very easy for users, you can move executable in this way:

Linux
Modify path to backend executable in
${HOME}/.mozilla/native-messaging-hosts/scrapbee_backend.json

Mac
Modify path to backend executable in
${HOME}/Library/Application Support/Mozilla/NativeMessagingHosts/scrapbee_backend.json

Windows
Modify registry entries' value to be new path if you moved scrapbee_backend.json
HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\NativeMessagingHosts\scrapbee_backend
HKEY_CURRENT_USER\Software\Mozilla\NativeMessagingHosts\scrapbee_backend

Modify path to backend executable field in that scrapbee_backend.json

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When it's all done, restart firefox.