Editor Save Page with Firefox Results in Broken Styles

[wesleyboar]

Describe the bug
Editting page 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 and save.
3. See UI broken yet all stylesheets record as loaded.

Expected behavior
Page UI does not break when saving.

Screenshots

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Desktop (please complete the following information):

• Firefox

Workaround

0. Save and see problem.
1. Close broken tab.
2. Open in new private tab.
3. Refresh.
4. Close private tab.
5. Open in new normal tab.
6. Refresh.
7. If still not fixed, close and reopen browser and load page.