No. of Recommendations: 1
You might want to try this addon as I saw major improvement in FF when using it.

Auto Tab Discard a lightweight extension that uses the native method (tabs.discard) to unload or discard browser tabs which significantly reduces the memory footprint of your browser when many tabs are in use.

If you are used to keeping many tabs opened at once during your work, this extension could help you to keep your browser fresh with low memory usage by parking (hibernating) inactive tabs. This also helps portable devices to save battery.
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