Hello,

Please try installing this add-on instead:

https://addons.mozilla.org/en-us/firefox/addon/youtube-10423/

Does that work?

Thank you for your reply.

I don't want to install addon for youtube search. I just wanted to know if I can install the youtube search engine as before.

After some reading on the internet I found that search engine is described by a small XML file that is available through a link on the page. All other pages with working search engines like Wikipedia or IMDb generates XML content or refers to XML file. But the link of youtube opensearch descriptor points to an opensearch.osdx file.

I don't know if it is the extension, or if there is unsupported tag in it but Firefox is not willing to handle it and add youtube to the search engines.

I found this page: http://www.tobtu.com/customsearch.php I copied the relevant tags to the input fields and added YouTube Video Srearch. Now it works fine.

But the question remains: is it Firefox that cannot handle youtube's sandard opensearch descriptor or is it youtube.com that provides a faulty descriptor?

No. Just install it like eddyc said. It downloads it when you hit Add "Youtube" to your search bar anyways... his way is just manual.

I was having the same problem, clicked the link below, and now it works again!

https://addons.mozilla.org/en-us/firefox/addon/youtube-10423/

It works great!

See also [/questions/974588]