I can confirm that this issue does not apply to Mozilla's builds of 64-bit Firefox. Could the problem be because of optimizations made when it was compiled? For instance, my Firefox was optimized for AMD, but Mozilla's builds I think are optimized for Intel.
I can confirm that this issue does not apply to Mozilla's builds of 64-bit Firefox. Could the problem be because of optimizations made when it was compiled? For instance, my Firefox was optimized for AMD, but Mozilla's builds I think are optimized for Intel.