[Zotero extension +] Firefox v116 on macOS broken Discourse?

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I am also seeing various broken behaviours on Discourse sites in Firefox. I am using Firefox Nightly (2023-08-21) on macOS 13.5.

Most “active” features which rely on in-page scripting appear to silently fail for me, including:

  • opening the user menu by clicking my avatar at the top right
  • transitioning to some posts by clicking on their titles
  • loading additional posts in long threads
  • posting replies (they do go through, but I have to refresh the page manually to see them)

As @glimfeather mentions, I can sort of workaround loading a thread by forcing it to load in a new tab to see the initial posts, but there are still many other broken features.

I only started to notice this today, so I would assume it’s a recent Discourse change that went live for hosted sites in the last few days.

When I reach the bottom of a long thread (such as Install the Discourse Theme CLI console app to help you build themes), I can see that the browser’s developer console is full of many errors like:

Uncaught TypeError: can't access property "lastNode", this.last is null
    lastNode runtime.js:916
    lastNode runtime.js:4347
    lastNode runtime.js:1008
    evaluate runtime.js:4424
    _execute runtime.js:4306
    execute runtime.js:4291
    rerender runtime.js:4606
    Ember 2
    It runtime.js:4139
    Ember 3
    invoke queue.ts:201
    flush queue.ts:98
    flush deferred-action-queues.ts:75
    _end index.ts:616
    end index.ts:298
    _run index.ts:667
    _join index.ts:640
    join index.ts:362
    Ember 2
    start screen-track.js:52
    setupController topic.js:289
    setup Ember
    s router_js.js:1514
    routeEnteredOrUpdated router_js.js:1524
    setupContexts router_js.js:1470
    finalizeTransition router_js.js:1378
    promise router_js.js:1321
    y rsvp.js:435
    v rsvp.js:421
    invoke queue.ts:203
    flush queue.ts:98
    flush deferred-action-queues.ts:75
    _end index.ts:616
    _boundAutorunEnd index.ts:257
    promise callback*n/< platform.ts:28
    flush Ember
    _scheduleAutorun index.ts:803
    _ensureInstance index.ts:791
    schedule index.ts:384
    Ember 6
    <anonymous> start-app.js:4
    <anonymous> discourse-boot.js:20
    <anonymous> discourse-boot.js:1