Save/Publish Page Edit with Firefox Unloads Styles

[wesleyboar]

Describe the bug
Saving/Publishing page edit in Firefox causes broken UI.

To Reproduce
Steps to reproduce the behavior:

1. Be logged in as a CMS editor.
2. Edit a page e.g. edit text.
3. Save — and if no bug yet — Publish.
4. See UI broken yet all stylesheets record as loaded.

Expected behavior
Page UI does not break when saving nor publishing.

Screenshots

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Desktop (please complete the following information):

• Firefox

Workaround

0. Save and see problem.
1. Close broken tab.
2. Reopen broken tab.
3. _{If still not fixed}
   Open in new private tab.
4. _{If still not fixed}
   Refresh.
5. _{If still not fixed}
   1. Close private tab.
   2. Open in new normal tab.
6. _{If still not fixed}
   Refresh.
7. _{If still not fixed}
   1. Close browser.
   2. Reopen browser.
   3. Load page.

[wesleyboar]

Still happens with Firefox 149.