Firefox's performance settings

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Note: This article applies to Firefox version 55 and above.
Please update your version of Firefox for the latest features and security updates.

Firefox automatically uses settings that work best with your computer. You can modify these settings in your Firefox OptionsPreferences page. Click the menu button New Fx Menu Fx57Menu and choose Options.Preferences. In the General panel, go down to the Performance section and uncheck the box next to Use recommended performance settings. You will then be able to change the following settings:

  • Use hardware acceleration when available: This allows Firefox to use your computer's graphics processor, if possible, instead of the main processor, to display graphics-heavy web content such as videos or games. This frees up resources on your computer so it can run other applications, like Firefox, faster. This box is checked by default but the feature isn't available for all graphics processors. You must restart Firefox after changing this setting, before it will take effect.
  • Content process limit: With Multiprocess Firefox, also called electrolysis or e10s , Firefox runs web content for all tabs separately from the main Firefox process for increased security and performance. Using multiple content processes can further increase performance and minimize the impact of content process crashes. You can modify this setting if multiprocess is enabled; however, having too many content processes can slow down your computer, and consequently, Firefox. The recommended maximum is four, but you can set up to seven.

Fx55-56settings-Performance

Tip: If your computer's system informationIf the information about your Mac shows more than 8 GB of RAM, you might want to try bumping up the number of content processes that Firefox uses from its default value. Additional content processes can improve performance when using multiple tabs, but will also use more memory.

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