_ff-addon-snippet-SwapBrowsersAndDONTCloseOther -

_ff-addon-snippet-SwapBrowsersAndDONTCloseOther.js

var tabIdToReplace = 'panel-3-248';
var tabIdToReplaceWith = 'panel-3-249';

var aTabToReplace = null;
var aTabToReplaceWith = null;


function swapBrowsersAndDONTCloseOther(aOurTab, aOtherTab) {
	console.log('here, this:', this);

	// Do not allow transfering a private tab to a non-private window
	// and vice versa.
	var window = aOurTab.ownerDocument.defaultView;
	if (window.PrivateBrowsingUtils.isWindowPrivate(window) !=
		window.PrivateBrowsingUtils.isWindowPrivate(aOtherTab.ownerDocument.defaultView))
		return;

	console.log('h1');
	// That's gBrowser for the other window, not the tab's browser!
	var remoteBrowser = aOtherTab.ownerDocument.defaultView.gBrowser;
	var isPending = aOtherTab.hasAttribute("pending");

	/*
	            // First, start teardown of the other browser.  Make sure to not
	            // fire the beforeunload event in the process.  Close the other
	            // window if this was its last tab.
	            if (!remoteBrowser._beginRemoveTab(aOtherTab, true, true))
	              return;
	*/

	let ourBrowser = this.getBrowserForTab(aOurTab);
	let otherBrowser = aOtherTab.linkedBrowser;

	// If the other tab is pending (i.e. has not been restored, yet)
	// then do not switch docShells but retrieve the other tab's state
	// and apply it to our tab.
	if (isPending) {
		window.SessionStore.setTabState(aOurTab, SessionStore.getTabState(aOtherTab));

		// Make sure to unregister any open URIs.
		this._swapRegisteredOpenURIs(ourBrowser, otherBrowser);
	} else {
		// Workarounds for bug 458697
		// Icon might have been set on DOMLinkAdded, don't override that.
		if (!ourBrowser.mIconURL && otherBrowser.mIconURL)
			this.setIcon(aOurTab, otherBrowser.mIconURL);
		var isBusy = aOtherTab.hasAttribute("busy");
		if (isBusy) {
			aOurTab.setAttribute("busy", "true");
			this._tabAttrModified(aOurTab);
			if (aOurTab.selected)
				this.mIsBusy = true;
		}

		this._swapBrowserDocShells(aOurTab, otherBrowser);
	}

	console.log('h2');

	// Handle findbar data (if any)
	let otherFindBar = aOtherTab._findBar;
	if (otherFindBar &&
		otherFindBar.findMode == otherFindBar.FIND_NORMAL) {
		let ourFindBar = this.getFindBar(aOurTab);
		ourFindBar._findField.value = otherFindBar._findField.value;
		if (!otherFindBar.hidden)
			ourFindBar.onFindCommand();
	}

	/*
	// Finish tearing down the tab that's going away.
	remoteBrowser._endRemoveTab(aOtherTab);
*/

	console.log('h3');

	if (isBusy)
		this.setTabTitleLoading(aOurTab);
	else
		this.setTabTitle(aOurTab);

	// If the tab was already selected (this happpens in the scenario
	// of replaceTabWithWindow), notify onLocationChange, etc.
	if (aOurTab.selected)
		this.updateCurrentBrowser(true);

	console.log('succ done');

}

Cu.import('resource://gre/modules/Services.jsm');
var DOMWindows = Services.wm.getEnumerator('navigator:browser');
while (DOMWindows.hasMoreElements()) {
	var aDOMWindow = DOMWindows.getNext();
	if (aDOMWindow.gBrowser && aDOMWindow.gBrowser.tabContainer) {
		var tabs = aDOMWindow.gBrowser.tabContainer.childNodes;
		for (var i = 0; i < tabs.length; i++) {
			var aTab = tabs[i];
			var aTabId = aTab.getAttribute('linkedpanel');
			console.log('tab id:', aTabId);
			if (aTabId == tabIdToReplace) {
				aTabToReplace = aTab;
			} else if (aTabId == tabIdToReplaceWith) {
				aTabToReplaceWith = aTab;
			}
			if (aTabToReplace && aTabToReplaceWith) {
				console.log('both found');
				console.log('swap them now');
				swapBrowsersAndDONTCloseOther.bind(aTabToReplace.ownerDocument.defaultView.gBrowser, aTabToReplace, aTabToReplaceWith)();
				break;
			}
		}
	} else {
		//this window does not have any tabs
	}
}

README

Rev1

• I was going about overriding the _beginRemove and _endRemove but realized that's not the way to go as we have to do the swaps to the other tab

Rev2

• Works but I need to swap to the tab that gets closed (aTabToReplaceWith)