How to get a Tab with a Browser in a Firefox Addon/Extension

getTabFromBrowser.js

function getTabFromBrowser(browser)
{
	var tab_container = gBrowser.tabContainer;
        var browser_panel = browser.parentNode.parentNode;

	for (var i = 0; i < tab_container.itemCount; i++)
	{
		var tab = tab_container.getItemAtIndex(i);
		if (tab.linkedPanel == browser_panel.id)
		{
			return tab;
		}
	}
}