Making sure the domains listed in this article are allowed by your firewall or other software ensures that Firefox works correctly.

Update Service (Firefox and GMP)

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Remote Settings

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Download locations for Firefox

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Telemetry

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Captive Portal Detection

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Safe Browsing

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Pocket

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Mozilla accounts

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Sync

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Tracking Protection

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Location Services

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OpenH264 Video Codec Download

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Widevine Content Decryption Module Download

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DNS over HTTPS

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Extension Update

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Extension Metadata for about:addons

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New Tab Sponsored Tiles

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New Tab Sponsored Stories

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New Tab Ads

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Firefox Suggest

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