Not working in FF 146. But in FF 148.0.2 it does work.

You often have to try multiple times for a link to properly be removed, but it does work (eventually)

Works for me! Even after a page refresh.

消したり消せなかったり・・・

Right-click and "Remove from History" in context menu works - link looks as "unvisited", but once the page is refreshed, the link is back to "visited"

Doesn't seem to actually work. Link shows as visited after refresh.

Easy clear visited links, just right click and remove. Perfect!