I'm still having this problem with all software based X servers. This is
e.g. Xnewt on SunRay 1g (ubuntu 8.04.1 64-bit up to the latest version
except for the kernel). Also the framebuffer X server on the PS3, this
is ubuntu 8.10 ppc64  latest version.

On my desktop PC, with the nvidia card, that's an ubuntu 8.04.1 (latest
updates), the problem went away, probably because I upgraded the nvidia
drivers to the beta 180.16. If nitpicking, you can still notice it a
very tiny bit. but as there is re-rendering done (with those div css
styles), it's probably ok, one would expect it to be little slower - but
really, almost unnoticable.

It's probably the same problem as here:
https://bugs.launchpad.net/firefox/+bug/125970, were they also state
that the newest nvidia drivers solve the problem.

I've read somewhere that it might have to do with the cairo backend that
uses a feature that's not  implemented correctly (or badly in the case
of nvidia drivers).

Note that on windows and MacOS X, firefox always ran smoothly.

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