Firefox: Responsive design testing for Mobile devices

Follow the below steps to set the preset value for responsive design testing on mobile devices

i) Go to the address bar in firefox and type “about.config

ii) You will get a warning message stating “This might void your warranty … Changing these advanced settings can be harmful to the stability …..”. Click the button “I’ll be careful, I promise!’

iii) In the search bar, type “presets” and look through the filter values for “devtools.responsiveUI.presets“. Double click on the preference name “devtools.responsiveUI.presets” and enter the values

[{“key”:”320×480″,”name”:”iPhone 3g/3gs”,”width”:320,”height”:480},{“key”:”360×640″,”name”:”Nokia E7, n90″,”width”:360,”height”:640},{“key”:”640×960″,”name”:”iPhone4/4s”,”width”:640,”height”:960},{“key”:”640×1136″,”name”:”iPhone5/5c/5s”,”width”:640,”height”:1136},{“key”:”768×1024″,”name”:”ipad1/2″,”width”:768,”height”:1024},{“key”:”800×480″,”name”:”Android-WVGA”,”width”:800,”height”:480},{“key”:”800×1280″,”name”:”KindleFireHD8.9″,”width”:800,”height”:1280},{“key”:”2048×1536″,”name”:”Retina display”,”width”:2048,”height”:1536},{“key”:”600×800″,”name”:”KindleFire/Galaxy/Nexus”,”width”:600,”height”:800}]

Once the values are entered, you can open a new instance of the browser and click ctrl + shift + m to open up the responsive web view


Responsive web page testing tools available online


Interesting site to test mobile web pages of various screen sizes (kindle fire, samsung galaxy tab, google nexus 7, apple ipad 1 – 3 mini, kindle fire HD,  motorola razr v3m, motorola razr v8, blackberry 8300, apple iphone 3 & 4, LG optimus S, Samsung galaxy S2, ASUS galaxy 7, apple iphone 5, samsung galaxy s3/s4)

Also this tool offers landscape and portrait modes in addition to scroll & retina effect.

StudiopressResponsive testing

Responsive test from responsivetest.net

Another interesting tool available online to check web page responsiveness on mobile phones, tablets, laptops and desktops. The web tool has resolutions for testing categorized by devices Apple, Blackberry (Bold 9930, Q10, Torch 9810, Torch 9850, Z10), Samsung, HTC, LG

Other tools

Browser resizing – http://resizemybrowser.com/

Responsive pixel – http://responsivepx.com/

Demonstrating responsive design – http://www.jamus.co.uk/demos/rwd-demonstrations/

Refer Wikipedia for the display of devices by pixel density http://en.wikipedia.org/wiki/List_of_displays_by_pixel_density


Firefox: Developer Friendly Browsing Tool

Firefox is one of the best tool available for web developers which equips the developer with code testing and debugging capabilities.

There are many useful firefox options and extensions that comes in handy during software development life cycle and in this article we will be listing few of useful plugins that we commonly use.

To find information related to the page that is getting displayed on the browser click Tools > Page info. This will give you permission settings of a page, security identity of the page, feed url and other page specific information like page content-type, encoding, meta tags used, cookie permission settings etc.

Web Developer extension
Added as a toolbar in firefox, this extension gives CSS related information, page information, outlines page elements, tab index, gives topographic information and many such details.
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Javascript Memory Leak Diagnosis

What is meant by Memory leak?
Memory leakage refers to obtrusive memory handling techniques adopted in programs which leads to increased load time and poor performance.

Various scenarios can cause memory leaks which can range from unhandled memory garbage to cyclic references to error in code logic. One best suggestion given in the javascript forums to overcome this problem is to nullify the element once its usage is over.
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Javascript code organization for optimized performance

Knowing how javascript code gets executed in a browser will help us organize the libraries or functions for better performance.

Javascript unlike the server side scripting languages like PHP, ASP, Perl is not compiled at the server side. It is sent as-is from the server to the browser client and it is the browser that interprets the code at the client side.

The total size of the Javascript code and its organization will have a significant effect on the pages served at the client side which in turn will affect the performance of the page.

Organize the libraries in such a fashion that you only have the needed functions associated with the page. You can consider this point right at the time of creating your template pages. This will reduce the number of javascript pages that are called from one page. Continue Reading…


How to open ALL external web sites or references in a NEW window?

Using JQuery to open external links in new windows

Earlier we used to write a string of code in javascript to enable opening external references in a new window in addition to modifying the html code

With JQuery, this can be done with one line of code as shown below


The above line checks for occurences http in a tag and if a link has “http” in it, JQuery opens the link in a NEW window.

According to W3C standards, the target attribute has been removed from xhtml 1.1 specification.

Sample script to open external links in New Window

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-GB">
<script src="js/jquery-1.3.2.min.js" type="text/javascript"></script>
<script language="javascript">

Testing the pages - Open Links in new <a href="http://yahoo.com">window</a>.

<h1><a href="http://www.kurinchilion.com">Kurinchilion</a></h1>

Free Fugue Icons under CCA License

If you are a web designer or a programmer with a sense of site aesthetics, visit Pinvoke.com which has a HUGE! collection of icons (as of this writing 2225 icons) in PNG format distributed under Creative Commons Attribution License.

Yusuke Kamiyamane has given a thought in developing this extensive set of icons which will definitely be a handy collection in structuring the sites. Kudos to Yusuke.


PHP: Buffer Overflow

PHP Program Flow
A call that is made to execute a sequence of code in PHP program is sent to PHP core library written in C programming language which in turn would talk with the underlying operating system to get the results of its execution.

What is buffer?
A buffer is a temporary memory location to hold data for faster program execution time. The data may be stored as a heap or as a stack. Stack can be visualized as a FILO array of data and heap as a linked list of data.

Why we need to take care of buffer overflows?
Programmers who know about certain loop holes can exploit this feature in by pointing a record in the heap or stack to prewritten block of hackable code. These are called buffer overflow attacks.
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JQuery: Showing a progress image while processing background task

I thought to write a simple example to show a progress bar or a gif image showing a that a task is happening at the background using a jquery function.

i) Include jquery script file in the header section and the following code in the head

<script language="javascript">
    $("#main a.bgdiv").click(function(){
        return false;

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cakePHP: Session enabled messages using Session->setFlash

There are different ways to flash or publish the messages for a user action. Usability plays a major role in determining how the navigation pattern for a web application takes place.

  • publishing the outcome of user action on the same page
  • designing a single page to flash all success, error, warning, notice level messages
  • designing a separate page for each message that gets published for the user

Continue Reading…

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