Found the issue. It worked fine in Chrome, but did indeed cause the issue in Firefox.
The modification you're looking for will be as follows:
Code:
#page_galaxy input[type="number"] {
padding: 0.25rem !important;
vertical-align: 1px;
min-width: 3rem;
height: 1.8rem;
color: var(--col-text-main);
}
It's in the files linked above now, with a few other very minor fixes.