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{{warning|Firefox must have already been built successfully locally. See [https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Build_Instructions/Simple_Firefox_build Building Firefox] for details.}}
[https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/mach mach] is used to run the [[https://firefox-source-docs.mozilla.org/Tests|testing/perfdocs/talos.html#test-definitions Talos tests]] locally. You can run suites of tests or individual tests on their own.
For example, to run the 'chromez' test suite:
