Chrome Capturing Visible Tab not working - javascript

The code in buttonClicked() function and onTabCreate() function worked when the button is the BrowserAction icon.
But when I added a popup.html and created few buttons in it. When "Trello" button is clicked. I want the code in buttonClicked() to be executed, I put this code in eventPage.js.
The control is reaching the function, but I'm unable to capture the visible Tab now.
Why is it so? How can I fix this?
As evident from the code, imageData is holding the image of the tab (3rd line in buttonClicked())
The last 4th line in buttonClicked(), calls onTabCreate(). InonTabCreate(), I'm passing the imageData, but I'm not receiving the image.
I'll furnish more info if needed.
Thanks
buttonClicked()-
function buttonClicked() {
chrome.tabs.captureVisibleTab(null, {}, function (image) {
imageData = image;
createdTabUrl = chrome.extension.getURL('cardCreate.html');
chrome.tabs.query({ active: true }, function (tabs) {
var i, tab;
// Only select the current active tab, not any background tab or dev tools
for (i = 0; i < tabs.length; i += 1) {
// TODO: more robust way to check if current tab is a page from this extension (either when I get a static extension id or with a flag)
if (tabs[i].url.match(/^http/) || tabs[i].url.match(/^chrome-extension.*\/cardCreate\.html$/)) {
tab = tabs[i];
}
}
chrome.tabs.create({ url: createdTabUrl, index: (tab.index || 0) + 1 }, onTabCreated);
});
});
}
onTabCreate()-
// TODO: more robust way to send image data to page ?
function onTabCreated(tab) {
setTimeout(function (){
chrome.runtime.sendMessage({ imageData: imageData }, function(response) {
// Callback does nothing
});
}, 1000);
var views = chrome.extension.getViews();
for (var i = 0; i < views.length; i++) {
var view = views[i];
// If this view has the right URL and hasn't been used yet...
if (view.location.href == createdTabUrl) {
console.log("----------------------");
// console.log(view);
// console.log(view.location.href);
}
}
}
chrome.browserAction.onClicked.addListener(buttonClicked);
EDIT :
window.onload = function() {
document.getElementById('loginText').addEventListener('click', login);
document.getElementById('Trello').addEventListener('click', buttonClicked);
//listener for ButtonClick
// In popup.html , I included eventPage.js as well.
};

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chrome.webNavigation.onCompleted fired before completion?

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The permissions in the manifest are "tabs", "history", "webNavigation"
When I check with the developer console and do:
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Chrome extension: callback function not getting called

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FireFox Toolbar Prefwindow unload/acceptdialog Event to Update the toolbar

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-------edit-------
var prefManager = {
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So this is my implementation.
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In esbTB_observe() you have to read the values of your prefs and adjust the toolbar.

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