firefoxdeveloperedition alias resolves surprisingly on macOS

[watters]

Is this a feature request or a bug?

A bug.

What is the current behavior?

Using the firefoxdeveloperedition alias for the -f option results in an attempt to launch a binary within /Applications/FirefoxDeveloperEdition.app rather than /Applications/Firefox Developer Edition.app, which fails (error below).

It looks like web-ext delegates alias resolution to node-fx-runner. I have filed a corresponding issue against node-fx-runner, but thought it was worth noting here as well because the alias is explicitly documented by web-ext.

As noted in the node-fx-runner issue, there are a couple of ways it attempts to resolve this alias, and they all appear to fail. I've worked around it, but it may be worth fixing OR at least removing from the documented set of options. I'm happy to do the work in web-ext or node-fx-runner.

Reproduction

Install Firefox Developer Edition from the official download location on macOS.

Command:

web-ext -f firefoxdeveloperedition run

Output:

Running web extension from /Users/watters/Dropbox/code/birdcage/dist
Error: spawn /Applications/FirefoxDeveloperEdition.app/Contents/MacOS/firefox-bin ENOENT
    at Process.ChildProcess._handle.onexit (internal/child_process.js:267:19)
    at onErrorNT (internal/child_process.js:469:16)
    at processTicksAndRejections (internal/process/task_queues.js:84:21)

What is the expected or desired behavior?

The expected behavior is that Firefox Developer Edition would be launched.

Version information (for bug reports)

• Firefox Developer Edition 79.0b7 (64-bit):
• macOS Catalina Version 10.15.5:
• Paste the output of these commands:

node --version && npm --version && web-ext --version

v12.17.0
6.14.5
4.3.0

[Rob--W]

It would be nice to fix this with the next minor release, but if we don't have a minor release the major version would be good too.