HTML5 is the latest version of HTML, which is a core technology of internet and used to structure and present content for the World Wide Web. HTML5 is under development and some websites does not support it. To access these websites, you have to disable HTML5. Here we will discus about a Firefox add-on which will allow you to disable and enable HTML5 support in a singe click. This add-on is meant for Firefox 4.
After installing HTML5 Toggle, you can use it from tools to enable or disable HTML5 or, you can add the HTML5 Toggle button to a toolbar. The HTML5 Toggle button is not added by default to any tool bar, to add the button you have to go to View >> Toolbars >> Customize >> drag the button to your desired location on the browser. Now you can easily disable or enable HTML5 in Firefox 4 by clicking on the button.
If any website will not support HTML 5, you can disable it temporarily by clicking on the button and again continue with HTML5 by enabling it.
Download HTML5 Toggle Extension for free and use it with Firefox 4.0b8 to 4.0b11.