Mixed content warning due to favicon not being saved

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I am getting a mixed content warning due to the website favicon not being saved. Is there any way I can force mixed content to not show? Meta removes the favicon right away. The onebox link is this one:

http://abstractions.nautil.us/article/682/the-near-magical-mystery-of-quasiparticles

Update: Looks like there is a solution here:

Problem with https with favicon in onebox

This issue is not due to the TLP plugin (the topic title needs updating). For example, you can see it currently on @adorfer’s site here, even though TLP is disabled. Also, I’ve added the offending links on @adorfer’s site (German newspaper websites need to migrate to https ) to my sandbox and the .ico download behaviour (and https) works normally. See further here: https://discourse.angusmcleod.com.au/c/tlp The reason you were seeing some difference between safe mode and norma…