How i can stop this google nag banner to login in third party websites?

Install UBlock Origin
Click the extension's icon
Click the gears icon for settings
Open the "My filters" tab
Add a line with ||accounts.google.com/gsi/iframe/select?*

Steps 2 and 3 can be replaced by going to about:addons, finding UBlock Origin, clicking the ... button and selecting "Preferences".

As an additional note this rule is already included in either EasyList – Other Annoyances or AdGuard – Popup Overlays. I recommend just enabling either full category for a more usable internet.
- I can't seem to block them by just enabling annoyances blocks on my end.
  
  "EasyList – Other Annoyances" has this:
  
  ! Google signin popup ###credential_picker_container ###credential_picker_iframe
  
  "AdGuard – Popup Overlays" has this:
  
  ! Warning: check, if auth using Google is not broken ||accounts.google.com/gsi/client^$third-party,script,domain=<several specific domains here>
  
  My impression is that the rules want to avoid breaking Google sign-in completely, which this rule may do.
- It must be the former because I have the latter enabled and still see them

Set your language to English: you'll get the nag in English.

🥁🪘🥁

Sorry...

Seriously though, install Ublock Origin and block as many Google domains as possible. In Reddit, to get rid of that particular nag, block accounts.google.com and google.com.

Alternatively, don't do Reddit.

Alternatively, don't do Reddit.

"Cpt. Obvious move" detected. I like it.
Old reddit redirect or popup off could probably work as well (both are exentions on firefox).
- Click the eye dropper symbol in uBlock, that opens the element picker.
  
  Next, click the popup, and then preview > apply

As other people have mentioned, you can use uBlock Origin to hide these banners.

For Reddit specifically, I recommend using a private frontend called Redlib. You can install LibRedirect to automatically redirect all Reddit links to Redlib.

noscript stops these dead.

also stops most other nefarious things sites want to do in your browser.

also stops many good things, so your day to day surfing will encounter more friction, but be safer.

Technically yes, but the Google and Googlegetmanager scripts are used in so many cases that you want to keep them active permanently.
- those are two of my favourites to block, but that's just me

Ah dude no1 has pointed u to the holy grail. Here u go my fellow human https://www.reddit.com/r/uBlockOrigin/wiki/solutions/#wiki_google_login_dialogs_on_various_pages

P.s. there is only ublock. Ublock is king/queen

Thanks, commenting to find this later.
- There is a save comments function on Lemmy 😉

For optics only:
Use uBlock Origin, choose the object picker and remove the banner.

For real blocking: Use uBlock Origin and block the Google domains as suggested in another answer.

I've tried to remove the banner with ubo on firefox and it has never worked. I think google is doing some weirdness with it.
- You can always try out some premade blocking lists as someone who knows way better than both of us has probably already encountered the same problem.
  You can also try to use wildcards with your blocking list as some ad and tracking companies add random alphanumeric characters to their URLs to circumvent blocking.

I got annoyed by something similar (E: also a google sign in pop up, in the same spot, though looks a little different than yours) not too long ago and found this worked:

https://support.google.com/accounts/thread/219332922?hl=en&msgid=222171998

I tried that multiple times. GOogle ignores my setting.
- This is how the relationship is with them. I moved on 10 years ago, they fought my every step, e.g. suddenly exporting from Drive didn't work.
  
  Like all toxic relationships, you're better off without them.
- That sucks. I had an issue at first with it only giving the option for android even though I'm on pc, but eventually I managed to get it right, I think there was another sub menu or something, I can't remember exactly since it was a few months ago now.. If that's not it, I guess give some of the other options given here a try?

Non usare chrome nel caso fosse il tuo browser e installa ublock su firefox

Don't speak the language but 100% agree
- Something something no Chrome something something install uBlock and Firefox.
  
  Did I get it right?

Install ublock, add a filter to block the login prompt in the “my rules” section

Can’t find the exact rules I have but when I’m on my desktop i can reply with them, there’s a bunch of variants I found searching for it but they should all work (unless googles changed stuff)

https://forums.linuxmint.com/viewtopic.php?t=382324

I use this rule: accounts.google.com/gsi/* Is yours similar?
- Yep!
  
  ||id.google.com^ ||accounts.google.com/gsi/$3p ||smartlock.google.com^ ||accounts.google.com/gsi/iframe
  
  Feels pretty overkill at this point, can't help assume most of its redundant but I haven't run into any issues yet. I got them from this firefox support thread a while back
- That's the one I use as well and it gets rid of the sign in popup without breaking or blocking other Google sites.

Redlib

Worth noting, this isn't really a Google thing. It's something other websites do to allow you to login with various other credentials: Facebook, Google, Amazon -- Twitter used to be common. It's just that Google is obnoxious because when say Reddit allows you to login with your Google account, the login widget Google uses is an obnoxious pop-up.

It Is a Google thing. It's a script that Google gives to third party to promote logging in with their account, and it can access Google cookies, so it can get populated with your name and email (which is absurd as some other malicious js on the same page could parse the HTML to extract the personal data of the user without consent)

If you're logged in, there's a setting buried in the Google account (really buried, very difficult to find) which hides this nag.
- What I mean by it not being a Google thing is that it doesn't just appear there on its own, like it might if it were a Doubleclick ad or something.
  
  This is something that companies like Reddit see and think "Yes, I want that obnoxious thing on my site".

I disable javascript by default (with a keybind toggle, I think noscript can do something similar in normie browsers), and I never get these.

Firefox on its own blocks some of these popups (in some countries). Otherwise, add some annoyance filters in ublock origin

There is a feature (permission) in new versions of Chromium that can help. I don't remember the name though.

I don’t know either, but keen to see what people suggest!

I use Fennec for Firefox. Fdroid can then do updates. I disabled Play Store and Services. plugins work on Fennec.

For reddit, try old.reddit.com with Vivaldi. It is chromium based so works on sites with chrome/blink bias, but also has built-in adblocker (needs to be turned on in prefs). For me, old reddit font scaling is better on Vivaldi than Fennec.