This script adds 3 keyboard control options on a game's giveaway page on SteamGifts. The three keys are conveniently placed for QWERTY keyboard users. You use a different keyboard type, let me know which one (and maybe suggest your preferred keys), and I'll think about an easy way to toggle between these formats.

1. Hide a game

Use Alt+Q to toggle a game's hiding dialog, and press Alt+Q again to confirm hiding it.

2. Enter/withdraw in/from a giveaway

Use Alt+A to enter in or withdraw from a giveaway - it's basically a toggle switch.

3. Go back to the giveaways page

Use Alt+Z to return to the giveaways page. Clearly, that's only be possible if you entered a game's giveaways page from the giveaways page in the same browser tab, but that's usually the case.

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On a final note, I kept the code as simple, readable and commented as possible, for anyone curious enough to make sense of it.