Firefox, Mouse tracking: Unable to report text in Mermaid renderings.

[hwf1324]

Steps to reproduce:

1. Open in Firefox: https://deepwiki.com/nvaccess/nvda
2. Use the mouse to view nodes with text in the Mermaid rendered graph.

Actual behavior:

Does not report text under the mouse.

But the text under the mouse is reported in Chrome.

And there is a corresponding text leaf node in Firefox's Developer Tools - Accessibility Tree.

Expected behavior:

Report the text under the mouse.

NVDA logs, crash dumps and other attachments:

System configuration

NVDA installed/portable/running from source:

install

NVDA version:

Version: alpha-36536,3bc449b2 (2025.2.0.36536)

Windows version:

Windows 11 Version 24H2 (OS Build 26100.4061)

Name and version of other software in use when reproducing the issue:

Firefox Nightly: 140.0a1 (2025-05-25) (64-bit)

Other information about your system:

Other questions

Does the issue still occur after restarting your computer?

Yes

Have you tried any other versions of NVDA? If so, please report their behaviors.

Yes

If NVDA add-ons are disabled, is your problem still occurring?

Yes

Does the issue still occur after you run the COM Registration Fixing Tool in NVDA's tools menu?

Yes

[hwf1324]

CC: @jcsteh