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Firefox crashes

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I keep receiving a warning that my computer has no memory to sustain Firefox and then it closes. I have enough space on my computer, so this should not be an issue. It started doing this 6-7 times a day. I don't know how to fix it

I keep receiving a warning that my computer has no memory to sustain Firefox and then it closes. I have enough space on my computer, so this should not be an issue. It started doing this 6-7 times a day. I don't know how to fix it

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1. Why are you using that old Firefox 40 version? The current release version is Firefox 51.0.1 .

2. That message is about RAM, not disk storage space.