There's a new banner shown on some of the technology Stack Exchange sites:

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Every podcast episode now seems to be similarly advertised:

Podcast banner

Podcast Episode #126: We chat GitHub Actions, fake boyfriends apps, and the dangers of Legacy code. Listen now.

When I dismiss these banners on e.g. Stack Overflow, I expect them to disappear from other sites as well. But that doesn't happen.

I regularly visit a lot of sites in the network, a permanent solution would be most welcome.

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    Yeah this starts to be super annoying, almost the same as spam emails. We get promotion stuff cluttering the page where we never asked for those at all. – Shadow The Vaccinated Wizard Oct 2 '19 at 7:54
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    TamperMonkey or GreaseMonkey, either is for you. – iBug says Reinstate Monica Oct 2 '19 at 8:18
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    For the record, I still consider this a bug: "Indicates a reproducible problem on the site that you believe is due to a mistake, malfunction, or programming error." It's both a mistake and a design error. – Glorfindel Oct 3 '19 at 7:09
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  • Adblock works a treat – Richard Oct 31 '19 at 17:46
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    It does dismiss network wide... it just takes a minute. – Catija Oct 31 '19 at 18:01
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    @Catija wow, you're right. It took five minutes, actually, but that's definitely an improvement. – Glorfindel Oct 31 '19 at 18:11
  • @Catija I still have the podcast banner on all sites, except MSE, where I dismissed it ~1 hour ago. – pkamb Oct 31 '19 at 18:24
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    @pkamb It's not enabled here on MSE in the first place. Give dismissing it on another site a go and see if it sticks? – Adam Lear Oct 31 '19 at 20:02
  • @AdamLear ok, new bug report then: podcast banners do not appear on MSE! Took about 3 minutes for the X to transfer from SO to other sites. – pkamb Oct 31 '19 at 20:19
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    @pkamb It's not a bug, it's a deliberate decision not to show the banner on this site. (And a handful of others - MathOverflow and international SO sites). – Adam Lear Oct 31 '19 at 20:19
  • @AdamLear the We’re rewarding the question askers & reputations are being recalculated! banner IS being shown on MSE! Is it just Podcasts banners that aren't? But blog posts are? – pkamb Nov 13 '19 at 19:27
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    @pkamb Which sites show which banner depends entirely on the banner. It's all configurable depending on the needs. – Adam Lear Nov 13 '19 at 19:50
  • @AdamLear something seems to be wrong again, then. 30 minutes ago I dismissed the banner on MSE, but it's still there on SO. – pkamb Nov 13 '19 at 20:16

When you're logged in, dismissing the banner should already apply network-wide - we set a cookie that is then picked up by Redis and the state cached based on your account id. I believe it does require another page load, though (for us to actually read the cookie and update the cache), and it might take a few minutes to propagate across all servers.

For anonymous users, dismissals are still per-site. We could probably switch to setting the cookie per second-level domain, but at the moment there are no plans or time to do so, if I'm entirely honest.

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    As a logged in SO / SE user who then visits a no-account site via HNQ or similar, we see the banner again. Probably expected, I guess that's an "anonymous user", but still weird. – pkamb Nov 1 '19 at 16:17
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    @pkamb Ooh, good point. We can actually fix that, though. Would you mind writing up a separate bug report for that, please? – Adam Lear Nov 1 '19 at 22:13
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    @pkamb Thanks, much appreciated. – Adam Lear Nov 1 '19 at 22:36
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    I'd vote for an option to disable it forever. I know it's just one click, but I really don't care for ads like "We now integrate with Microsoft Teams, helping you to connect your internal knowledge base with your chat." – Arjan Nov 7 '19 at 11:11
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    I'm not the only one being annoyed by all the messages it shows: Can we reserve the top bar announcements for actual site news? Please, prevent banner-blindness! – Arjan Nov 21 '19 at 17:50

It turns out this happened before with the Net Neutrality banner. It now happens again with the podcast with the new CEO, so I've modified the script and officially launched it on Stack Apps:

Dismiss Announcement Banner

(GitHub link for direct installation)

It uses cross-domain storage to remember if you have dismissed the banner, so every time you see one it's guaranteed to be one you've never seen before.

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