if you get this error:    Port error: Could not establish connection. Receiving end does not exist.  miscellaneous_bindings:236    chromeHidden.Port.dispatchOnDisconnect miscellaneous_bindings:236        Uncaught Error: Attempting to use a disconnected port object  miscellaneous_bindings:58    PortImpl.postMessage miscellaneous_bindings:58    responseCallback miscellaneous_bindings:143    xhr.onreadystatechange      That means you have make some mistake as this discussed:     This is caused when a connection get closed. For example if you open a tab that has the content_script injected, it opens a connection, the tab is closed, and then the background_page tries to pass a message. It will fail because the tab is no longer active to receive the message.   In your case I would guess that as tabs close and new tabs open you are attempting to post messages with the old tabId instead of creating a new connection to the new tab. I would recommend reading through the  long-lived connectio...
 
 
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