Night theme not correctly loading in background on Firefox

[bar1004]

Hi, I recently transitioned to Firefox from Chrome and noticed a bug that wasn't present in Chrome, though I dunno if the bug is inherent to browser itself - when loading SteamGifts site in background tab night theme typically doesn't load unless I transition to the tab shortly after opening the tab (sometimes it works even after longer time, but I can't find why), other enabled elements (infinite scrolling and join buttons) load normally. Problem is totally absent when reloading the page or loading page in foreground tab.

[LoneDestroyer]

I have a similar issue after switching from Chrome to Firefox.
The following pages in the Giveaways section don't get the Night theme but the rest of the pages do. These pages worked on the Chrome version.

• https://www.steamgifts.com/giveaways/wishlist
• https://www.steamgifts.com/giveaways/created
• https://www.steamgifts.com/giveaways/entered
• https://www.steamgifts.com/giveaways/won