web-ext:tldr:e2e0e
The command "web-ext sign" is used to sign a web extension package with Firefox for distribution. Web extensions are add-ons that extend the functionality of the Firefox browser.
In this specific command, the "--api-key" flag is used to specify the API key needed to authenticate with Mozilla's signing service. The ${api_key} placeholder is meant to be replaced with the actual API key you have obtained from Mozilla.
Similarly, the "--api-secret" flag is used to specify the API secret needed for authentication. The ${api_secret} placeholder is meant to be replaced with the corresponding API secret you have obtained.
By running this command with the correct API key and secret, the "web-ext" tool will sign your web extension package, making it ready for distribution through Mozilla's extension gallery or other platforms.