Assuming it's 11 years old (late 2010 model), it can run up to High Sierra, which both the most recent Chrome and Firefox will support.
If it's the Mid-2009 model (the next older model), it can still run El Capitan and therefore the newest Chrome.
If it's the Mid-2009 model (the next older model), it can still run El Capitan and therefore the newest Chrome.
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