User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:86.0) Gecko/20100101 Firefox/86.0

Steps to reproduce:

We're using what I'm fairly sure is the standard way to bundle Angular 1.x apps using Browserify under Gulp:

var files = await glob( paths.scripts );
var b = browserify({
    entries: files,
    debug: true,
    transform: [ngAnnotate]
});

return b.bundle()
    .pipe(source('app.min.js'))
    .pipe(buffer())
    //.pipe(cachebust.resources())  TODO should then take name, add/replace to index.html instead of cacehBustTask
    .pipe(sourcemaps.init({loadMaps: true}))
    .pipe(uglify())
    .on('error', log.error)
    .pipe(sourcemaps.write('./'))
    .pipe(gulp.dest(paths.output));

Actual results:

Can set break points, but inspection of all values always undefined.

Works fine in Chrome

Expected results:

Can set break points, but inspection of all values shows actual values.

Works fine in Chrome and FireFox

v86.0.1 arrived today, and no change

Here is a minimal test case : https://github.com/tomchiverton/bugzilla-1700600

Clone it, run "npm install" and then "npm run serve"

Open the given URL.

Observe the log message.

Use CTRL-P to open app.js in the debugger and set a break point on the console.log line (line number 10).

Press F5 to refresh.

FireFox stops on line 10.

Hover over "$state" at end of line 8. Shows as undefined.

Do the same steps in Chromium, shows as a complicated object.

Thanks for reporting and the test case.
I can reproduce it.

Still breaks in FF89.

How can we get traction on this ?

Still broken in v102

Finally got some chance to look into this
This relates to map scopes been switched off. Once switched on it works (as shown in attached screenshot)
Also see https://bugzilla.mozilla.org/show_bug.cgi?id=1680228#c3
We are looking into turning map scopes on by default in Bug 1695621.

Closing this for now.