TOC hidden in Firefox

[ElizabethN]

I'm using Firefox 34.0.5 and the TOC ghosts away when my cursor is not hovering. It works 🅰️-🆗 in Chrome and Safari.

This is what I mean:

Hope that helps!

[jordanmccullough]

Thanks for opening this @ElizabethN. Definitely looks like it needs a fix. ✨

[jordanmccullough]

Will come back to this if this continues. Backlog-ing for now.