Off-hand, I don't think TippyTop service was the cause here. Since neither "mail.google" nor "wapo" is included in the TippyTop manifest, it's very unlikely that TippyTop will associate icons to any of these two sides. I suspect that the issue was caused by the incorrect icon links in the Places favicon database. See [here](https://searchfox.org/mozilla-central/source/browser/components/newtab/lib/TopSitesFeed.jsm#786-803) for more details about how TopSitesFeed finds favicons to the sites. :rbarnes - is it possible to run the debugger through the above function with your profile to see what's going on there?
Bug 1687135 Comment 5 Edit History
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Off-hand, I don't think TippyTop service was the cause here. Since neither "mail.google" nor "wapo" is included in the TippyTop manifest, it's very unlikely that TippyTop will associate icons to any of these two sides. I suspect that the issue was caused by the incorrect icon links in the Places favicon database. See [here](https://searchfox.org/mozilla-central/source/browser/components/newtab/lib/TopSitesFeed.jsm#786-803) for more details about how TopSitesFeed finds favicons for the sites. :rbarnes - is it possible to run the debugger through the above function with your profile to see what's going on there?