Share trigger has odd behaviour on Firefox

[finnnnnnnnnnnnnnnnn]

When triple clicking to select a paragraph in Firefox the share tooltip appears on the left side of the screen instead of directly below the paragraph as it should. This works correctly on Chrome, and it works correctly when clicking and dragging to select the paragraph in Firefox.

This issue occurs on both Firefox 144.0 and Librewolf 143.0.4-1

Video demonstrating the problem:

triple-click.webm