If you set it to false, Firefox will not rewrite old Flash YouTube embed code if Flash is not installed or enabled. Find plugins.rewrite_youtube_embeds using search.Confirm that you will be careful if a warning prompt is displayed.Load about:config in the browser's address bar.It is already part of the organization's Nightly web browser and enabled by default.įirefox users who don't require the feature, can deactivate it in the following way: Mozilla plans to launch the feature in Firefox 46. If Flash is installed in the browser, nothing changes at all as Flash will be used in the case to power the video player. It needs to be noted that Firefox won't enforce the use of HTML5. This affects YouTube embeds on third-party sites only. Mozilla added code to its Firefox web browser to convert embedded YouTube videos using the old Flash embed code to the new embed code if Flash is not installed or enabled on the page. Since Mozilla does not have the luxury of a native Flash integration and the fact that plugins will be a thing of the past in the near future, something had to be done about that. The second video on the same page uses the new embed code and it won't show the error message as the HTML5 video player is used in this case automatically. If you take this old Ghacks article on Line Rider, and there specifically the first video embedded on the page, you will get the error message "A plugin is needed to display this content" if Flash is not installed in the browser or blocked on the site. If that is not the case, a "plugin is missing" error message is displayed. The Flash code works fine after all these years, but only if Adobe Flash is installed in the browser. From a technical perspective, YouTube started to offer embed codes as iframes instead of objects. YouTube changed the code later on to reflect changes in streaming technologies. When YouTube started out, Flash was the dominating technology used to stream video on the Internet, and the first player that YouTube made available to webmasters to embed videos on third-party sites used Flash exclusively.
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