Cannot See Cursor in WYSIWYG Editor When Using Firefox Browser

I am unable to see the cursor in the WYSIWYG editor when I try to compose a reply in this Dell forum using my default Firefox browser.  This problem started a few weeks ago around the same time I updated to Firefox v126.0.0 (rel. 14-May-2024) or Firefox v126.0.1 (rel. 28-May-2024).  Disabling all browser extensions and restarting Firefox does not solve the problem.   I have not tested other Firefox-based browsers like Pale Moon, Waterfox, etc.

This issue does not occur when I post in other (non-Dell) forums with my Firefox browser.

I am able to see the cursor if I sign in to this forum with my MS Edge browser, even when browser extensions like uBlock Origin and Malwarebytes Browser Guard are enabled in MS Edge.
----------
Dell Inspiron 15 5584 * 64-bit Win 10 Pro v22H2 build 19045.4529 * Firefox v127.0.0 * Microsoft Edge v126.0.2592.61 * Microsoft Defender v4.18.24050.7-1.1.24050.5 * Malwarebytes Premium v5.1.5.116-1.0.1252 * Macrium Reflect Free v8.0.7783