3 column layout broken with Firefox ESR

[ronnyadsetts]

See this page as an example of the breakage - it applies to all of the documentation pages at https://developer.wordpress.org as far as I can see:

https://developer.wordpress.org/advanced-administration/security/mfa/

I use my web browser at about 1300 pixels wide. The breakpoints for this issue seem to be about 1384 at the top and 752 on the bottom end. Anywhere within that width, the site doesn't work for me. I'm using Firefox ESR 115.9.1.

Two screenshots attached, one at the top of the page showing the whitespace where the

content should be; the second showing scrolled down with the

with "position: fixed" overlaying the

.

I noticed this a while ago but didn't know where to report issues. It's finally got sufficiently annoying that I took the time to find this github repo.

Let me know if you need more info to reproduce.

[adamwoodnz]

Thanks for the report. I can reproduce with Firefox ESR on MacOS, but not any other browser so far.