User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:2.0b4pre) Gecko/20100817 Minefield/4.0b4pre Build Identifier: Mozilla/5.0 (Windows NT 5.1; rv:2.0b4pre) Gecko/20100817 Minefield/4.0b4pre ID:20100817131637 When decode-on-draw is enabled, random favicons in the sidebar do not display until they receive a mouseover. This happens only when decode-on-draw is enabled. It is not a discarding issue, as the bug does not happen if discarding is enabled but decode-on-draw is disabled. You see this with history sidebar, when in "By Last Visited" mode. Reproducible: Always Steps to Reproduce: 1. Configure History sidebar to view "By Last Visited" 2. Make sure you have a reasonable amount of browsing history (at least enough to fill the length of the history sidebar) 3. Enable image.mem.decodeondraw, but make sure image.mem.discardable is disabled 4. Restart the browser 5. Open History sidebar 6. Notice that some favicons do not display until you mouseover 7. Compare this with image.mem.decodeondraw disabled.

I suspect bug 589815 may have fixed this. Will confirm later.

Too many check-ins within relevant window, so can't confirm which one fixed it, though I still suspect bug 589815. Resolving WFM. Mozilla/5.0 (Windows NT 5.1; rv:2.0b5pre) Gecko/20100824 Minefield/4.0b5pre ID:20100824040950 http://hg.mozilla.org/mozilla-central/rev/9a623cc1c5e7

(In reply to comment #2) > Too many check-ins within relevant window, so can't confirm which one fixed it, > though I still suspect bug 589815. It was almost certainly that bug - I landed it specifically to fix the favicon issues.