Broken scrolling with Orca structural navigation in Firefox

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Explain the Problem

Structural navigation with Orca wraps around in Firefox much sooner than it should.

Steps to Reproduce

Explain what you did to encounter the issue

1. Have a list of unread news items
2. Try navigating between them using the Go to next heading command of Orca, e. g. the H key (the 1 for level 1 headings works too)
3. Observe that after four normal and an additional fifth article the Orca navigation wraps around

System Information

• News app version: 5.0.2
• Nextcloud version: 30.0.2
• Cron type: Not relevant
• PHP version: Not relevant, it is a front-end issue
• Database and version: Not relevant, it is a front-end issue
• Browser and version: Firefox 132.0.2
• OS and version: current Arch Linux, but would be same on all Linux flavors

No errors in any logs, and surprisingly, this works in Chromium.

Start by reproducing the issue in Firefox 132.0.2 with Orca using a list containing at least five unread articles, then inspect the front-end heading structure and navigation behavior. Done means Orca can move through all unread articles without wrapping prematurely, with the behavior checked against Chromium.