User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b5pre) Gecko/20100820 Minefield/4.0b5pre ID:20100820074529 Build Identifier: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b5pre) Gecko/20100820 Minefield/4.0b5pre ID:20100820074529 Page scroll up causes rendaring issue. Changing mozilla.widget.render-mode=0 is no effect. Reproducible: Always Steps to Reproduce: 1. Start Minefield with new profile 2. Open URL tinderbox log( http://tinderbox.mozilla.org/showlog.cgi?log=Birch/1282300055.1282306799.23096.gz&fulltext=1#err0 ) 3. 4. Scroll to Page Buttom (push End Key) 5, Scroll up and down Actual Results: Rendering issue happens. Expected Results: No issue. Regression window: Works: http://hg.mozilla.org/mozilla-central/rev/92339b84d089 Mozilla/5.0 (Windows; Windows NT 6.1; WOW64; en-US; rv:2.0b2pre) Gecko/20100715 Minefield/4.0b2pre ID:20100715145415 Fails: http://hg.mozilla.org/mozilla-central/rev/e1d7fd5255fd Mozilla/5.0 (Windows; Windows NT 6.1; WOW64; en-US; rv:2.0b2pre) Gecko/20100715 Minefield/4.0b2pre ID:20100715152722 Pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=92339b84d089&tochange=e1d7fd5255fd Candidate Bug: Bug 564991 - Retain layers and layer contents

I guess there might be a relation with bug 586627 here.

Yes, bug 582146 will probably fix this.

Is this fixed now?

Fixed by 582146.