So recently I've had problems viewing any part of galleries beyond the first page, and I was completely unable to view sub-galleries at all. It turns out it's an ad-blocking program integrated into Firefox. The good news is that the solution is simple.
Under the Tools tab, go to "AdBlock Plus" and open the pop-out window. From there, select "Preferences". In preferences, click on "Adblock Options". A drop down menu will open. From there, select "Site Blocking/Whitelisting". In the popup window that opens, type in the following:
@http (https://www.deviantart.com/http):// www. deviantart. com
(You'll have to remove the spaces from the web address above) Press "Add Current S