firefox-custom-new-tab-page
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To protect your security...
I have both the i-frames and force links to open in top frame checked. Tried both with and without, I still get the "To protect your security..." error with opening a new tab. This seems to only be the case on Google sites as I'm trying to make my custom tab open to Google News.
I have the same issue when hosting an HTML bookmark file that has an href to anything cloud.
To protect your security, outlook.office.com will not allow Firefox to display the page if another site has embedded it. To see this page, you need to open it in a new window.
[Learn more…](https://support.mozilla.org/xframe-neterror-page)
Report errors like this to help Mozilla identify and block malicious sites
no combination of these help
Same, I'm hosting an instance of https://github.com/sharevb/it-tools locally in a Docker container and trying to open that in my new tabs and getting the security warning even with the extension options checked.