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Looks like the fix of Firefox’s longest surviving bug introduced another bug.
WTF!
Yes. You found a “child” of the most ancient bug.
File a bug report on bugzilla.mozilla.org (search “tooltip” for duplicates first!) and mention it using its number tag in the famous Bug #148624 thread so that its 55 subscribers take notice.
It should take no more than 22 years to fix.
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