Checkboxes are shown as quotation in rich text editor (Firefox)

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UPDATE 2025-10-21:

Linked to #577149 (closed) same Firefox rendering issue with additional technical details from browser dev tools showing abnormal element sizing.

Two independent reports confirm this is a Firefox-specific bug in edit mode.

We are running the self hosted community edition of Gitlab v18.2.1. When using the rich-text markdown editor, checkboxes are no longer shown as checkboxes. This used to work until (I think) v18.1 (?). The same behavior is visible in the editor on gitlab.com in which I am writing this issue.

Examples:

This is a list of checkboxes:

- [ ] something
- [ ] some other thing
- [ ] one last thing

When I use 'switch to rich text editing' at the bottom of the card you'll see this:

Or given some ticked boxes:

This is a list of checkboxes:

- [x] something
- [x] some other thing
- [ ] one last thing

When the message is saved it will render correctly, so it seems to be related to the rich-text viewer only.

Steps to reproduce

• Create a new issue or reply
• Create some check boxes in the plain text editor
• Switch to rich-text editor, you'll see that you checkboxes are gone and are now some kind of quotation
• Switch back and everything is normal
• Save the message and note that the message is shown with normal checkboxes again
• Tick a checkbox and note that they also still function as checkboxes