Running official 64-bit AVX optimized version of Pale Moon on an old processor without AVX instruction set through Intel Software Development Emulator version 8.59 (none of the current versions seem to emulate anything here):
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It launches in over 3 minutes with extensions, loads web pages, but very slowly, practically unusable. Technically interesting, but not practical experiment.

It launches in over 3 minutes with extensions, loads web pages, but very slowly, practically unusable. Technically interesting, but not practical experiment.