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Broken for me on firefox still.

Example current sale page: https://www.gog.com/promo/20190315_weekend_sale
Even the search box on the page is missing 'owned' games.
States "Games you don't own" 0/24, I select all, goto check out, and it turns it into a gift purchase because some of the games are in my account.

Compared to the front page, properly showing 'owned' for stuff I own, and the search box is working fine there.
avatar
BAZ: Broken for me on firefox still.

Example current sale page: https://www.gog.com/promo/20190315_weekend_sale
Even the search box on the page is missing 'owned' games.
States "Games you don't own" 0/24, I select all, goto check out, and it turns it into a gift purchase because some of the games are in my account.

Compared to the front page, properly showing 'owned' for stuff I own, and the search box is working fine there.
Did you try disabling Firefox extensions and plug-ins ?
If nothing else try running Firefoxin safe-mode :
https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode

GOG still have not fixed the owned games issue on offer pages but the Norton plug-in issue is fixed at least in my browser...