I removed 4GB of RAM in my late 2011 15" MacBook Pro and replaced it with 8GB of that RAM. After that Firefox and Safari worked for 15 minutes until I then installed the new RAM removed and put the old one back in, the browser freeze problem was gone.I would like to return these sticks but due to delays in shipping to where I was then living (a small caribbean island) I was past the return deadline.Certified for the Working with Apple products I would leave the rating without stars but Revain won't allow it.
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