Make Trigger Key preference exclusively trigger pop-up

[pacoverde]

When I set the "Trigger key" preference in Firefox 85.0 (64-bit) on mac OS 10.15.7 Catalina to e.g. "alt" the Trigger key preference works, however simply double-clicking a word continues to trigger the pop-up definition.

Sometimes I'm attempting to double-click a word in order to copy it or invoke some other function. I would prefer the Trigger Key preference be the only way to trigger the pop-up definition. Maybe add an option to make the Trigger Key exclusively trigger the definition look up pop-up? In other words, an option to make the Trigger Key setting override the double-click to look up functionality.