I'm developing a Google Chrome extension, which produces an error I can't fix.

My manifest.json looks like this:

{
    "name": "my extension",
    "version": "1.0",
    "background_page": "background.html",
    "permissions": [
        "tabs",
        "<all_urls>"
    ],
    "content_scripts": [
        {
            "matches": ["<all_urls>"],
            "js": ["content.js"],
            "all_frames": true
        }
    ]
}

background.html tries to talk with content.js:

<script>
chrome.tabs.onUpdated.addListener
(
    function(tabId, changeInfo) 
    { 
        chrome.tabs.sendRequest(tabId, {action : 'getMyValue'}, function(output) {
            console.log(output);
        });
    }
);
</script>

Finally, content.js:

chrome.extension.onRequest.addListener(function(request, sender, callback)
{
    if (request.action == 'getMyValue')
    {    
        callback('test');
    }
});

Developer Tools console prints: "Port error: Could not establish connection. Receiving end does not exist." in "miscellaneous_bindings" on line 232.

Any ideas?

I'm developing a Google Chrome extension, which produces an error I can't fix.

My manifest.json looks like this:

{
    "name": "my extension",
    "version": "1.0",
    "background_page": "background.html",
    "permissions": [
        "tabs",
        "<all_urls>"
    ],
    "content_scripts": [
        {
            "matches": ["<all_urls>"],
            "js": ["content.js"],
            "all_frames": true
        }
    ]
}

background.html tries to talk with content.js:

<script>
chrome.tabs.onUpdated.addListener
(
    function(tabId, changeInfo) 
    { 
        chrome.tabs.sendRequest(tabId, {action : 'getMyValue'}, function(output) {
            console.log(output);
        });
    }
);
</script>

Finally, content.js:

chrome.extension.onRequest.addListener(function(request, sender, callback)
{
    if (request.action == 'getMyValue')
    {    
        callback('test');
    }
});

Developer Tools console prints: "Port error: Could not establish connection. Receiving end does not exist." in "miscellaneous_bindings" on line 232.

Any ideas?

• javascript
• google-chrome-extension

• 1 Can't reproduce. Any conflicting extensions? Also, are you aware that onUpdated is fired twice for each pageview? – Rob W Commented Jul 4, 2012 at 13:34
• How can i figure out if there are any conflicting extensions? Is it possible to debug extensions in incognito mode? – TorbenL Commented Jul 4, 2012 at 14:50
• 1 A1. Either start Chrome using a new profile (chrome --user-data-dir=%tmp%\%random% in Windows, chromium-browser --user-data-dir=/tmp/$RANDOM under Linux), or disable all extensions, and add them one-by-one. A2. See this answer. – Rob W Commented Jul 4, 2012 at 14:56
• @RobW same error in incognito mode (no other extensions activated) :( – TorbenL Commented Jul 4, 2012 at 15:08
• @RobW New chrome profile prints "Port error: Could not establish connection. Receiving end does not exist.", too. function: chromeHidden.Port.dispatchOnDisconnect – TorbenL Commented Jul 4, 2012 at 15:12

1 Answer 1

chrome.tabs.onUpdated runs when a tab updates. Dev tools, chrome (extension) pages etc. are also included. To get rid of the error, you have to filter the URLs you cannot access.

chrome.tabs.onUpdated.addListener(function(tabId, changeInfo) {
    // Example: allow http:, https: and file:
    if (changeInfo.status === 'plete' &&
       /^(https?|file):/.test(changeInfo.url)) {
        chrome.tabs.sendRequest(tabId, {action: 'getMyValue'}, function(output) {
            console.log(output);
        });
    }
});