User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0
Steps to reproduce:
Visit https://givingtools.com/ask and scroll all the way to the bottom of the page. Then scroll back up to the top and click the "Q&A" navigation link. Scroll down a little bit and you'll see content from the previous page still being rendered behind the expandable questions.
I've tested this on the latest Firefox Nightly (v68.0a1 (2019-05-02) (64-bit)) as well as on my laptop running v66.03. Both running Ubuntu 18.04. My boss originally discovered this issue on his Mac running Firefox v66.0.1.
Content that has been removed is still visible until something overlays it (e.g. inspect element box overlays, resizing the page, switching tabs).
Well, I don't expect this glitch to appear.