Are you accessing the *arrs over your local network using an IP address, or are you using a domain?
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I'm accessing them through IP and port number. All of my *arrs are hosted in docker containers running on my Synology NAS.
I am actually experiencing this as well, noticed it happening in LinkedIn and Otta. Specifically when clicking the "Easy Apply" button. Seemed related to modal pop-ups to me but couldn't track down why.
Got a response from Proton. Main post edited.