Tabs Listener using Firefox SDK

Question

I'm trying to convert an existing Chrome extension into its Firefox equivalent, using the Firefox SDK.

My addon needs to detect whether Gmail (mail.google.com) is open/active in current tabs and, if not and in specific circumstances, start a Listener in order to add some parameters to Gmail's URL whenever a Gmail tab will be opened by the user.

To make it clearer, here is what my code looks like in Chrome:

background.js [Chrome extension]

// Reload Gmail Tab(s)
function reloadTab(order, behavior) {
    chrome.tabs.query({ currentWindow: true }, function(tabs) {

        var countGmailTabs = 0,
            ntabs = tabs.length;

        for (var i = 0; i < ntabs; i++) {
            var t = tabs[i].url;
            // Gmail found !
            if ( /mail.google.com/g.test(t) ) {
                countGmailTabs += 1;
                if(behavior === 'noisy') {
                    var GmailTab = tabs[i];
                    // Do something...
                } else {
                    // Reload Tab
                    chrome.tabs.reload(tabs[i].id);
                }
            }
        }

        // Gmail not found !
        if (countGmailTabs < 1 && behavior === 'noisy') {
            // Start listener
            chrome.tabs.onUpdated.addListener( GmailListener );
        }

    });
}

// Gmail listener
function GmailListener (tabId, info, tab) {
    if ( /mail.google.com/g.test(tab.url) && info.status === 'loading' ) {
        // Do something...

        // Now, let's relieve ourselves from our listener duties
        chrome.tabs.onUpdated.removeListener(GmailListener);
        return;
    }
}

My code in Firefox currently looks like this. The tricky part is implementing a listener for the tabs when a Gmail tab is not detected... Any help appreciated!

main.js [Firefox add-on]

var tabs = require('sdk/tabs')

// [...]

// Reload Gmail Tab(s)
function reloadTab(order, behavior) {

    var countGmailTabs = 0,
        ntabs = tabs.length;

    for (var i = 0; i < ntabs; i++) {
        var t = tabs[i].url;

        // Gmail found !
        if ( /mail.google.com/g.test(t) ) {
            countGmailTabs += 1;
            if(behavior === 'mute') {
                var GmailTab = tabs[i];
                // Do something...
            } else {
                tabs[i].reload();
            }
        }
    }

    // Gmail not found !
    if (countGmailTabs < 1 && behavior === 'noisy') {
        GmailTabListener(order);
    }
}

// Gmail Listener (the tricky part)
function GmailTabListener( action ) {
    tabs.on('open', function(tab){
        tab.on('ready', function(tab){
            if ( /mail.google.com/g.test(tab.url) ) {
                // Do something...

                return;
            }
        });
    });
}

Answer 1

You'll need to create a PageMod if the gmail tab isn't found, like so:

var pageMod = require('sdk/page-mod').PageMod({
  include: '*.gmail.com',
  attachTo: 'existing',       // See comment below
  onAttach: GmailListener
});

function GmailListener (worker) {
  var tab = worker.tab;
  var Id = tab.index;
  // Not sure what 'info' is
  pageMod.destroy();
  // Do something
}

Though I haven't tested it, you can add attachTo: 'existing' and you won't even need to cycle through the tabs as long as your // Do something function is the same in both situations.