Does anyone knows a way (or a filter/block list) to do block those pop-ups from Google asking to login or donate, either with uBO or some DNS list?
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Use something like NoScript, Ublock Origin, or an Adblocker and simply block the Google domain (could do it with hosts file too).
There’s another, less sledgehammer way to do it, I just forget at the moment.
If you do a web search for it, there are numerous published ways.
https://techpp.com/2024/05/28/disable-sign-in-with-google-on-websites/
In the ublock origins settings, go to filter lists. Under annoyances, enable the easylist - annoyances list.