I have Big Sur macOS 10.16 (20A4299v), Safari Version 14.0 (16610.1.15.51.2), XCode Version 12.0 beta (12A6159) installed and I am getting the error:
xcrun safari-web-extension-converter Language-Learning-with-Netflixv4.0.0.crx
Unable to parse manifest.json at file:///Users/codrut/Downloads/Language-Learning-with-Netflixv4.0.0.crx
excelsior_ink
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In my case it seems the developer included ^M characters in manifest.json. I have extracted the crx file.
Just run:
softwareupdate --ignore "Command Line Tools beta 5 for Xcode"
Ignored updates:
(
"Command Line Tools beta 5 for Xcode"
)