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Forgot to comment ;) There's concerns of the thumbnail service potentially leaking data leading to bugs like bug 1435432. There's also issues of thumbnails taking a while to show up. Turning on tracking protection should speed up thumbnails by reducing the number of connections needed!
See Also: → 1435432
These 4 pages do have content removed with tracking protection. It's most noticeable in the 2nd thumbnail where the top empty whitespace is gone and one of the page's image shows a broken image indicator.
Comment on attachment 8962841 [details] Bug 1449294 - Capture thumbnails with tracking protection always enabled. https://reviewboard.mozilla.org/r/231666/#review237688
Attachment #8962841 - Flags: review?(adw) → review+
Pushed by email@example.com: https://hg.mozilla.org/integration/autoland/rev/1504ecb0dc31 Capture thumbnails with tracking protection always enabled. r=adw
Comment on attachment 8962841 [details] Bug 1449294 - Capture thumbnails with tracking protection always enabled. https://reviewboard.mozilla.org/r/231666/#review241550 ::: toolkit/components/thumbnails/content/backgroundPageThumbsContent.js:43 (Diff revision 1) > priority = Ci.nsISupportsPriority.PRIORITY_LOWEST; > > docShell.allowMedia = false; > docShell.allowPlugins = false; > docShell.allowContentRetargeting = false; > let defaultFlags = Ci.nsIRequest.LOAD_ANONYMOUS | You should also add `nsIChannel::LOAD_CLASSIFY_URI` to that list so that Activity Stream thumbnails are automatically run through Safe Browsing. This will avoid taking screenshots of phishing or malware sites.
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