How to fix this bad error message “Not available for Firefox 48.0” in 1 easy way?


You see this message “Not available for Firefox 48.0”? Do not worry! The Turn Off the Lights first add-on version uses the XUL technology, and that is different to maintain the JavaScript code than the other modern web browsers.


In the fast-paced world of technology, web browsers are constantly evolving to offer a better user experience. But what happens when a popular browser, such as Firefox 48, no longer supports certain features? That’s where the term “Not available for Firefox 48” comes into play. In this comprehensive guide, we will delve into this topic, exploring the reasons, implications, and solutions to navigate this issue.

Not available for Firefox 48.0 issue. And user can solve it by installing the latest Firefox web browser

Since 24 August 2016, the Turn Off the Lights Firefox extension uses the WebExtensions technology that uses the same extension API supported by Google Chrome, Opera, and Microsoft Edge. The API is also fully compatible with multiprocess Firefox (called Electrolysis, sometimes abbreviated to e10s). The Electrolysis split Firefox into a UI process and a content process. The splitting UI from content means that when a web page is devouring your computer’s processor, your tabs, buttons, and menus won’t lock up either.

I see a message on the page “Not available for Firefox 48.0”

If you want to install the Turn Off the Lights Firefox extension on your web browser. And you see this error message “Not available for Firefox 48.0”? Then it is best to update your Firefox web browser, because the following data is version the latest support version in Firefox v48.

Version – that is the last XUL version for Firefox v48
Version and higher – that use the WebExtensions version for Firefox v49 and higher

You can download both files on this official Firefox extension gallery page.

The Implications of “Not available for Firefox 48”

The consequences of encountering “Not available for Firefox 48” can be quite frustrating. Here’s what you may experience:

  • Limited Functionality: As websites and extensions evolve, older browsers may struggle to render the content properly. This could result in limited functionality and a poor user experience.
  • Security Risks: Outdated browsers may lack the latest security updates, leaving you vulnerable to online threats. This is a significant concern in the digital age.
  • Incompatibility Issues: Not being able to access certain websites or features can be a real hindrance, especially if they are essential for your work or personal life.

Overcoming the Challenge

While encountering “Not available for Firefox 48” can be frustrating, there are several steps you can take to address the issue and enhance your browsing experience:

  • Upgrade Your Browser: The simplest and most effective solution is to upgrade to a newer version of Firefox or consider alternative browsers that offer more up-to-date compatibility.
  • Check for Updates: If you prefer using an older version of Firefox, make sure you regularly check for updates to ensure you have the latest features and security patches.
  • Use Browser Extensions: Some extensions can help you regain access to websites or features that may not be compatible with Firefox 48. Explore the Firefox Add-ons store for suitable extensions.
  • Contact Support: If you encounter a specific issue, consider reaching out to Firefox’s customer support for guidance and assistance.


Is there a way to continue using Firefox 48 without encountering this issue?

Yes, you can continue using Firefox 48, but you may face limitations when accessing certain websites or features. To enjoy a seamless browsing experience, upgrading to a newer version is recommended.

Are there any security risks associated with using Firefox 48?

Yes, using outdated software can expose you to security risks. To protect your data and online activities, it’s advisable to keep your browser up to date.

Can I still use my Turn Off the Lights extension with Firefox 48?

You may work with Firefox 48, but compatibility can be an issue. Because the Turn Off the Lights Firefox extension can not provide a fix for older web browser versions. For example a fix on the YouTube website.

Did you find technical, factual or grammatical errors on the Turn Off the Lights website?
You can report a technical problem using the Turn Off the Lights online technical error feedback form.

About The Author

Stefan Van Damme