Mosab | مُصْعَب

New Version of Power Close.

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New website, new icon, and improvements for the tab addict Firefox add-on


A Brief History

I have recently noticed that Power Close, my Firefox add-on, has reached a 1.5 K downloads milestone, which is way more than what I anticipated when I first created it. It was a very small hack for a very personal itch I have, and I never thought this many people had the same problem.

The first version published version, 0.2.1, was officially released on September 28th, 2014, on Mozilla’s add-on portal, and a couple days before that on GitHub. A few bug fixes and little improvements were released since that date, and then I got busy with my life and work.

download and usage stats

What’s New

Earlier this month, a new version 0.5.2 of the add-on was released. Here is a quick overview of the changes that took place.

New Icon

In older versions of the add-on, the logo used to be one of the icons designed by Freepik from Flat Icon, that was licensed under CC-BY License.

Old version of the icon

In this release, the icon used for the logo and the toolbar button is a mash of two icons from Google’s Material Design Icons that are published as an open source project under the CC-By License.

The new icon used

Selection Context Menu Option

In previous versions of the add-on, the user had to click in a non-interactive part of the page to see the "close all tabs from this domain" context menu item. This caused usability issues because the option didn’t appear if you right click on the page while having a portion of the text selected.

Now the same option is added to the “Selection Context Menu”, so now the user can still find this option in the context menu even if they have previously selected some text.

Switched to The New Firefox Add-on SDK

The previous versions of the add-on were developed using the now deprecated “cfx” sdk provided by Mozilla for Firefox add-on developers.

This new version is updated to make use of the new SDK named “jpm”.

New website

I have also registered a domain name for the add-on, and moved it from the sub-domain under my personal website, where it used to live, to

website face lift

The website was given a face lift to make it more usable, but this is an early release with new enhancements and features in the backlog. The website is hosted on Dreamhost, and is HTTPs enabled using a certificate issued from Let’s Encrypt.


I am also starting a newsletter for a better channel of communication with the users, where I consider it a matter of principal not to spam the subscribers with unnecessary emails.

You can sign up for the newsletter on the website:

Social Media Presence

I have also started a Facebook page and created a Twitter account for the add-on.

What’s Next

The downloads number has really caught me by surprise, mainly because I have not put any effort to marketing it. This inspired me to dedicate more effort into the project to make it more useful for the ones who are already using it.

This also inspired me to launch a side experiment by reading and learning about growth hacking, while applying what I learn on Power Close, and documenting my findings along the way.

I am still not 100% sure about the game plan for this experiment. If you have any tips, hints, or advice I would love to hear/read it.

Or you can click on the button below and add Power Close to your firefox browser now!

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