Do this:

1. Hard isolate

• Create a fresh Chrome/Brave profile with zero extensions.
• Re-test the same Discussion URL.

2. Find the offender

• In your normal profile: disable all extensions, re-test.
• Re-enable extensions one by one until it breaks.
• Pay special attention to: Stylus, Dark Reader, uBlock “My filters”, Tampermonkey, “GitHub enhancer”, font/zoom tools.

3. Confirm via DevTools

• Open DevTools → Elements → select the overflowing node.
• In Styles / Computed, look for overflow, max-width, position, display, white-space, contain.
• Check the source of the CSS rule (it will often show the extension stylesheet).

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