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What are WebExtensions from the Mozilla Firefox web browser version 49?

The WebExtensions technology that uses the same extension API supported by Google Chrome, Opera, and Microsoft Edge web browser. So the API is also fully compatible with multiprocess Firefox (is 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 and buttons and menus won’t lock up too.

WebExtensions in the Firefox add-ons gallery
Firefox new logo in the Firefox add-ons gallery

Firefox WebExtensions

If you want to install the Turn Off the Lights Firefox extension in your Firefox web browser. And you see this error message “Not available for Firefox 48.0”. Then this is the important notes on what web browser you can use this useful Turn Off the Lights Firefox extension version.

Version 3.2.0.12 – that is the latest XUL version for Firefox version 48
Version 3.2.0.15 – that use the WebExtensions version for Firefox version 49 and higher

You can download both Firefox extension version on the Turn Off the Lights Firefox extension history page. And for the latest version go to the official Turn Off the Lights download page. So where you can enjoy the latest and new innovated way to get the best video and web experience.

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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

Stefan Van Damme is the developer of the popular Turn Off the Lights browser extension, which he began building in December 2009 for Google Chrome. With over a decade of experience in the field, he has expanded the extension's availability to a wide range of web browsers, including Safari, Opera, Firefox, Maxthon, Brave, Vivaldi, Microsoft Edge, Yandex, and Naver Whale. His commitment to providing users with a quality product has made the Turn Off the Lights extension one of the most highly regarded and widely used browser extensions available. Additionally, the extension is free and Open-Source for all web browsers, and has been featured on major blogs such as Google, Microsoft, and Mozilla. With his extensive experience and knowledge in browser extensions, Stefan Van Damme is a highly qualified and authoritative figure in the field.