Mouseover cannot be dismissed

[lornajane]

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I am a keyboard-only user, and I use GitHub in Firefox with Vimium.

When viewing a list of issues or pull requests, if I open one in a new window, a large modal pops up (I think it's the mouseover/hover thing), but I don't have a mouse and I cannot therefore "mouseout" and remove it. I must therefore instead reload the page each time I return to the list. As a team lead and project maintainer, spend a lot of time with lists of issues and pull requests, often while screensharing, and it's frustrating to be constantly slowed down and losing my place in the list. Is there a way I can dismiss the modal or stop it from coming up in the first place?

I started noticing this a few months ago and I hoped that it was just a passing glitch, but it's really getting in my way. Advice or workarounds would be deeply appreciated!