Is Firefox eating your system memory then try this step. It will stop eating memory.

1. Open Firefox and go to the Address Bar. Type in about:config and then press Enter.
2. Right Click in the page and select New -> Boolean.
3. In the box that pops up enter "config.trim_on_minimize" without quotes. Press Enter.
4. Now select True and then press Enter.
5. Restart Firefox.
Now, Firefox will stop eating your memory.

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