Let’s check together some steps. With Firefox browser open, run UiPath.DiagTool.exe from a console (same folder as UiStudio.exe) and verify that ChromeNativeMessaging.exe is running; You may find this line:
*
- UiPath PROCESSES
Name: ChromeNativeMessaging.exe
Path: … \UiPath\BrowserExtension\ChromeNativeMessaging.exe
Arguments: … \AppData\Local\UiPath\UiPath-ff.json extension4ff@uipath.com
If this is not found, navigate to AppData\Local\UiPath\UiPath-ff.json and check “path” value, it should point to a valid location where ChromeNativeMessaging.exe is located.
Finally, there should be a valid registry pointing to UiPath-ff.json at Computer\HKEY_CURRENT_USER\Software\Mozilla\NativeMessagingHosts\com.UiPath.chromenativemsg
This info is also explained here https://docs.uipath.com/studio/standalone/latest/user-guide/firefox-extension