Bug 1359965 converted the WPT archive from a .zip to a .tar.gz. This made compression faster and produced a smaller archive. For reasons explained in the commit message to https://hg.mozilla.org/mozilla-central/rev/a0e257e346cc, we use zip files for hysterical raisins. We can likely convert other test archives from .zip to .tar.gz and reap some perf wins in automation. At this point, pretty much the only reason to retain zip files is: * Partial archive decompression (and the archive is large enough that the overhead of decompressing the entire tar stream matters) * Something downstream relies on zip files (but many mozharness consumers sniff file extension and act accordingly)
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