ContainSite by salmutt
Per-container fingerprint isolation — each container gets its own device identity
Extension Metadata
About this extension
Every website you visit is automatically placed in its own isolated container with a unique, deterministic device identity. Sites cannot share sessions, cookies, or correlate you through browser fingerprinting.
Features:
- Automatic per-site containers — no configuration needed
- 12 spoofed fingerprint vectors:
Canvas, WebGL, Audio, Navigator, Screen, Timezone, WebRTC, Fonts, Client Rects, Plugins, Battery, Connection
- Cross-site navigation automatically switches containers
- Options page to toggle individual vectors, whitelist domains, and manage containers
- Auth-aware — login redirects stay in the originating container
Works alongside Firefox Multi-Account Containers. No external dependencies.
Features:
- Automatic per-site containers — no configuration needed
- 12 spoofed fingerprint vectors:
Canvas, WebGL, Audio, Navigator, Screen, Timezone, WebRTC, Fonts, Client Rects, Plugins, Battery, Connection
- Cross-site navigation automatically switches containers
- Options page to toggle individual vectors, whitelist domains, and manage containers
- Auth-aware — login redirects stay in the originating container
Works alongside Firefox Multi-Account Containers. No external dependencies.
Rated 5 by 1 reviewer
Permissions and data
Required permissions:
- Access browser tabs
- Access your data for all websites
Data collection:
- The developer says this extension doesn't require data collection.
More information
- Add-on Links
- Version
- 0.2.0
- Size
- 31.65 KB
- Last updated
- 4 days ago (Mar 1, 2026)
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- Version History
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