When I have a New Tab page open and I visit a half a dozen other sites and come back to the new tab page I often see that the thumbnails are all gone and have to be restored when that page gets focus. This is an awful experience. The New Tab page should behave like browser chrome and should never have parts of itself disappear and then re-appear. I'm guessing that somehow New Tab page is participating in a memory pressure event that says to clear out images after a certain amount of time in the background. If that's the case, I hope this is an easy fix to not do that.
Adding Kyle as he seems to have worked on a couple of image discarding bugs. I don't know how easy or complicated it might be to exclude certain pages or if we maybe shouldn't do it for some reason.
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