Showing non-modal popup in overlay of browser.xul - on Windows

Hi. I've got a custom Firefox add-on in plain Javascript. It to overlays Firefox's browser.xul (via chrome.manifest) by an XUL file, where I would like to show a non-modal popup (or some kind of non-intrusive notification).
I've tried following three options from https://developer.mozilla.org/en-US/Add-ons/Code_snippets/Alerts_and_Notifications:
1.
Components.classes['@mozilla.org/alerts-service;1'].
getService(Components.interfaces.nsIAlertsService).
showAlertNotification(null, 'Some title', 'Some message', false, '', null);
2.
var win = Components.classes['@mozilla.org/embedcomp/window-watcher;1'].
getService(Components.interfaces.nsIWindowWatcher).
openWindow(null, 'chrome://global/content/alerts/alert.xul',
'_blank', 'chrome,titlebar=no,popup=yes', null);
win.arguments = [null, 'Some title', 'Some message', false, ''];
3.
var message = 'Another pop-up blocked';
var nb = gBrowser.getNotificationBox();
var n = nb.getNotificationWithValue('popup-blocked');
if(n) {
n.label = message;
} else {
var buttons = [{
label: 'Button',
accessKey: 'B',
popup: 'blockedPopupOptions',
callback: null
Neither of them works on Windows. The first two work on Linux (Fedora 20 x64). Neither of them generates any error either.
Please, suggest how/where to do that, or how to 'schedule it' (as an even handler to a system event, I suppose) from my overlay of browser.xul.

I think you would have a better chance of getting comments from experienced add-on developers on one of these sites:
* http://forums.addons.mozilla.org/
* http://forums.mozillazine.org/viewforum.php?f=19

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h3.
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Come on guys... I really need to know this. :(

TIP: Building Modal Popup Windows

Build Modal Popup Pages
Introduction
The following is based on the 'How To Document' - 'Build Custom Popup Pages'.
This How To will show the developer how to create Modal Popup windows with the ability to pass information back to the parent window.
Example Scenario
The example described in this how to adds a custom modal popup LOV to a form on the SCOTT.EMP table. Clicking the popup LOV link on the form page will popup a Modal LOV page that allows users to search by ENAME, JOB, and SAL. Selecting a value from this LOV page will close that popup LOV page and populate the ENAME, JOB, and SAL fields on the form page with the selected values. Additionally, had the user entered some data into the ENAME, JOB, and/or SAL fields on the form page, that data would be used in the initial search when the popup LOV page is first shown.
Step 1 - Create a simple form page on SCOTT.EMP
To create the form page, simply step through the HTML DB "Form on a Table or View" wizard against the EMP table accepting the defaults. For this example, create the form with a page number of one, and make sure to allow the ename, job, and sal fields to be editable. When the wizard completes, page 1 of the application should have the items P1_ENAME, P1_JOB, and P1_SAL on it as text fields.
Step 2 - Create a popup page with search fields
Next, create a page that's to be used as the popup window: Page 2. Ultimately, this page will have javascript, a report region, and some buttons. For now, though, just create a page 2 with the items P2_ENAME, P2_JOB, and P2_SAL on it as text fields.
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<base target="_self">
Step 4 - Add Javascript call to the popup page
Because the popup page should filter its result set based on any values that the user might have entered onto the form page, you need to add a javascript function that would pass those values off. Add the following function to the "HTML Header" field of the page-level attributes screen for page 1 to accomplish this:
<script language="JavaScript" type="text/javascript">
function callMyPopup (formItem1,formItem2,formItem3) {
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Step 5 - Add a popup link next to the P1_SAL field on the form page
Add a link to the form page that will call the callMyPopup function above and pass it the values it needs. To do so, place the following HTML in the "Post Element Text" field attribute of the P1_SAL item:
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In the previous step you added a call to a javascript function, passBack. Now add that function to the top of Modal popup page 2. In the same manner as step 4 above, add that passBack function to the page 2 by putting it in the "HTML Header" field of the page-level attributes screen. The function should look similar to the following:
<script language="JavaScript">
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Step 8 - Polishing
The basic functionality of this custom modal popup window has been created in steps 1 though 7. To make its usage a little more friendly, it's advisable to add Cancel and Search buttons to the popup window page. The Search button should just be added as a regular button that branches back to the page 2. Adding this button allows users to re-query for LOV options without having to return to our form page. The Cancel button should be created with an "Action" of "Redirect to URL". The "URL Target" of the button should be javascript:window.close(). As the code suggests, the Cancel button would just close the popup window (with no values returned).
Hope this is of use....

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> 1) In WDA, we cannot have non-modal window. Correct?
In what context you mean ? you can have external_window or link_to_url.
If you mean popup then it is not possible to have non-modal.
> 2) If we call external window within WDA then the same application will not work in portal environment (WDA iView). Please let me know if this is correct?
This is correct.

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