All the giveaways are on the one page. Does this exist?

i doubt it there might be 100's of active giveaways at any one time

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There are several browser extensions that can do what you're asking. I use one called "Autojoin for SteamGifts" ... in fact, that's how I discovered SteamGifts, I stumbled across the extension and was like "What's that?" Do NOT turn on the actual autojoin setting, that will get you banned (the extension even tells you this), but it has several other very nice features. Adding a join button to the front page next to the GA (still a "manual join" so no ban) and "infinite scroll" which means when it gets to the end of the current page it auto-loads the next page and tacks it onto the end, so from your perspective you have only one page (with ads every 15 GAs or whatever) are the two options I use the most.

I see all (8) active giveaways on one page. Trick is hide enough of them as you can know some games you would 100% never play anyway.