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firefox quantum consuming 3x memory on RAM compared to google chrome canary, wasn't it supposed to use less?(same tabs open)

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Okay so i just tried firefox quantum which was supposed to use 30% less memory than chrome while it actually uses 3 times more memory. Is there any explanation? I have the same tabs open on both the browsers. also : Google Chrome Version 71.0.3545.0 (Official Build) canary (64-bit) Firefox Quantum downloaded from website as of september 8, 2018.

Okay so i just tried firefox quantum which was supposed to use 30% less memory than chrome while it actually uses 3 times more memory. Is there any explanation? I have the same tabs open on both the browsers. also : Google Chrome Version 71.0.3545.0 (Official Build) canary (64-bit) Firefox Quantum downloaded from website as of september 8, 2018.

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