Created attachment 8591756 [details] Screen Shot 2015-04-13 at 12.29.19 PM.png User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:37.0) Gecko/20100101 Firefox/37.0 Build ID: 20150402191859 Steps to reproduce: This issue has been around for a long time. Fonts render extremely poorly when displayed over certain kinds of backgrounds. Once you've scrolled past the background, font rendering returns to normal. Actual results: Fonts display very poorly when displayed over a background, with extremely jagged aliasing. Please see the attached screenshot. Compare the top three instances of "(Self.DaystromInstitute)" to the bottom two. You can observe the behavior here: http://www.reddit.com/r/DaystromInstitute/ This is readily reproducible on my 2010 iMac running OS X 10.10. This does not happen using Safari. I am also seeing a similar issue while filling out this Bugzilla form, however I am seeing odd behavior. In the "What happened?" field, whenever text scrolls the aliasing gets completely destroyed - but it corrects itself after exactly five seconds. Expected results: Fonts need to remain consistently displayed.
Build ID: 20151208030212 User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:45.0) Gecko/20100101 Firefox/45.0 Hi, I tested this on Mac OS X 10.10 and I can reproduce this, fonts are displayed very poorly. On Chrome works ok. Go to this link: http://www.reddit.com/r/DaystromInstitute/ Fonts are displayed very poorly, see the attachment.
Presumably a matter of subpixel vs grayscale antialiasing....
(In reply to Boris Zbarsky [:bz] from comment #3) > Presumably a matter of subpixel vs grayscale antialiasing.... I'm not sure it's quite as simple as that. In attachment 8591756 [details], both the "bad" and "good" renderings of "(Self.DaystromInstitute)" show subpixel AA; but the bad ones look like they've been through some sort of traumatic filtering or gamma adjustment or something, leaving them a poor shadow of their former selves. (In reply to ccurzio from comment #0) > I am also seeing a similar issue while filling out > this Bugzilla form, however I am seeing odd behavior. In the "What > happened?" field, whenever text scrolls the aliasing gets completely > destroyed - but it corrects itself after exactly five seconds. I think this *is* grayscale vs subpixel AA, and it's linked to the difference between an active and inactive layer, or something. I see the same thing here (in Nightly) in a bugzilla comment field: scrolling causes the text to render with grayscale AA, and then after a few seconds of inactivity, it re-renders with subpixel AA. On a retina screen, I can barely tell the difference (magnifying the screen greatly makes it easier to see), but with a non-retina display it would be much more glaring. Moving this to Graphics, as I think it's all tied in with rasterization/layers/compositing/gfx-ish stuff like that.
Does this still reproduce?
Tested on Mac OS X 10.10 with FF 47 and FF Nightly 50.0a1 and I can't reproduce it. Ccurzio please retest with the latest FF version and see if you can reproduce it?