RC6 working very good with nightly Firefox 3.7 (as of 5/26/2010).
Flash intensive sites like http://www.universalorlando.com/harrypotter runs smoother than before. Perhaps further optimizations are being done, does "seem" smoother than earlier...
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Just opened a test 56page PDF file with graphs and charts and paged down until end and back up several times. Memory usage hovered around 46 megs, not even an issue with 2gig ram laptops. No problems here. YMMV depending if the PDF contains huge...
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Working fine even on firefox 3.7 alpha. I have never personally experienced a crash, even on flash heavy sites. Standard youtube video up to 480P works fine on my ancient pentium M laptop with 2 gig ram.