A cropped screenshot of the GMail web interface with all text redacted, and the "Upgrade" button highlighted with yellow.
https://sbonline.nyc3.digitaloceanspaces.com/media_attachments/files/113/997/950/995/749/588/original/456213d6682dd2ba.png
A quick tip for removing the "Upgrade" button that just started popping up in GMail.
If you use a browser plugin like https://stylebot.dev, you can use the following selector:
[data-action-behavior*="Upgrade"]
(Or whatever label this button uses in your language.)
Otherwise the classes here are pretty random and might easily change in the future. Hope this helps!
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