1) Open about:home Expected: favicon is search Actual: favicon is globe, then quickly switches to search, causing flicker Ew. :(
Actually, this appears to happen for all pages. For about:home specifically, we do some favicon cache magic here when we store favicon_search into the favicon cache  and then pull it out with the about:search url  which seems to get tied to about:home. Maybe if we didn't have to hit the cache, which likely returns async, we wouldn't have to override a default and this wouldn't happen? : https://mxr.mozilla.org/mozilla-central/search?string=favicon_search&find=mobile%2Fandroid&findi=&filter=^[^\0]*%24&hitlimit=&tree=mozilla-central : https://mxr.mozilla.org/mozilla-central/ident?i=BUILT_IN_SEARCH_URL
Summary: Flicker in favicon from globe to search when opening about:home → Flicker in favicon from globe to other when opening about: pages
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