XRender is always on, and used automatically through Cairo.
WebGL is the feature that gets turned on/off depending on your driver.
See https://wiki.mozilla.org/Blocklistin...aphics_DriversFree Mesa-based drivers are whitelisted if the Mesa version is at least 7.10 and the driver is not Gallium-based. See the discussion in bug 645407. Regarding Gallium, see bug 624935.
For example, the free Intel driver that ships in Ubuntu 11.04 is whitelisted.
For the NVIDIA driver, versions 257.21 and newer are whitelisted, exactly like on Windows (see above).
For the FGLRX (proprietary ATI) driver, we whitelist the newer versions that implement OpenGL 3.0 or newer. Indeed, FGLRX does not return any version number of its own, so we had to use the OpenGL version as a differentiator.
I don't use that patch if nightly releases doesn't include it by default. I couldn't compile ff
But worth to try...
As of today, Gallium3D drivers are no longer blacklisted.
This change will appear in tomorrow's Nightly, and eventually in Firefox 7. I'm trying to get it accepted in Aurora / Firefox 6, but no guarantees about that.