Rather than just the one that use the _download_webpage helper. The need for this was made apparent by 0fe7783e, which refactored _download_json in a way that completely avoids the use of _download_webpage, thus breaking youtube. Fixes #16323
0fe7783e
[ci skip]
Covered by generic extractor
smart extension rewrites straight quotes as curly quotes, -- as en-dashes and so on that is unwanted behavior.