Kynetx’s New Sandboxed Browser Extensions

I recently released my “Old School Retweet” Kynetx app in the Kynetx app store for the newly released browser extensions. I super love the new extensions and all that they do for users and developers alike. Something that I forgot when I released the app in the app store is that the new extension are sandboxed.

Because the extensions are sandboxed, all of the scripts from the extensions run a bit differently than they used to in the previous Kynetx extensions. Without getting into the technical details too much, the previous extensions just injected JavaScript into the page and the new extensions run JavaScript in a sandbox which has access to the DOM but can’t access anything else on the page. Because of this change my retweet app broke since I was using the jQuery loaded by to bring up the new tweet box (I do this because used that library to bind a click event and to trigger that event it has to be from the same library that bound it). Thankfully, with the help of a friend, I was able to get a work around for both Firefox and Chrome’s sandbox environment.

How I did it…

If the app is run not inside a sandbox I can just access the jQuery that loads to open a new tweet box


From within the Firefox sandbox I can access the page outside of the sandbox


If I am in the Chrome sandbox I can create a script element that has the JavaScript that I want to execute. Crude, but it works. : )

var trigger_click_script = document.createElement("script");
var fallback = "window['$']('#new-tweet').trigger('click');";
trigger_click_script.innerHTML = fallback;

Here is the JavaScript code that I ended up with that gets executed when a user clicks on the retweet button.

// get stuff to retweet
var tweet = $K(this).parents(".tweet-content").find(".tweet-text").text();
var name = $K(this).parents(".tweet-content").find(".tweet-screen-name").text();

// build tweet
var retweet = "RT @"+name+" "+tweet;

// open new tweet box

// hack for FF sandbox
if ($("#tweet-dialog:visible").length === 0) {

// put tweet in new tweet box
$K(".draggable textarea.twitter-anywhere-tweet-box-editor").val(retweet).focus();
$K("#tweet_dialog a.tweet-button.button.disabled").removeClass("disabled");

// hack for chrome sandbox
if ($("#tweet-dialog:visible").length === 0) {
  var fallback = "window['$']('#new-tweet').trigger('click'); ";
  fallback += "window['$']('.draggable textarea.twitter-anywhere-tweet-box-editor').val('"+retweet+"').focus(); ";
  fallback += "window['$']('#tweet_dialog a.tweet-button.button.disabled').removeClass('disabled'); ";
  var trigger_click_script = document.createElement("script");
  trigger_click_script.innerHTML = fallback;
} Catches Up With @MikeGrace

I saw today that has released a chrome and firefox extension to filter out tweets on about #SXSW.

I like the design they went with for the UI and it feels good to see a company like Lanyrd create an app that works similarly to what I built about 2 months ago. I decided to put my app interface in the side tray to allow for more controls. The app allows you to hide any tweet based on any word found in the tweet. It also allows you to highlight the tweet if you are interested in particular key words and it remembers your list each time you load the browser.

If you don’t have it, (you really should) you can get it and try it out at

Milestone Celebration For Filtering Foul Language On Twitter


My party stance

The Kynetx app that I built to filter out foul language on has filtered through over 200,000 tweets removing over 4,300 foul words!

When I originally built the app I didn’t think it would get used by enough people to get through that many tweets so quickly! I’m glad I was able to build this app and that others have enjoyed using it. If you would like to try it out you can get it at