Puppeteer: Channel {value} is not found.
Firefox's version metadata has no entry for the requested channel.
Firefox’s version metadata has no entry for the requested channel.
Error message
Channel {value} is not found.
{value} is replaced by the value shown in your error message.
How this error happens
Firefox release metadata did not include the requested channel’s entry. A malformed mirror response or incomplete metadata cache can make an otherwise valid channel impossible to resolve.
The failing command assumes the endpoint or provider condition described above; it is not expected to fail on a healthy installation.
npx puppeteer browsers install firefox
How to fix
Restore access to the correct browser archive and metadata endpoints, fix the nested HTTP or provider error, then rerun the package-managed browser installer.
npx puppeteer browsers install firefox
Things to keep in mind
The command is unchanged because the repair is in the network, mirror or installation environment. Do not disable TLS verification or assume every HTTP failure is a missing executable.