Container Rules Manager by Sarcastic Bird
Manage Multi-Account Containers site-to-container assignments. Add, edit, and bulk-manage rules with import and export.
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About this extension
Container Rules Manager gives you a full table view of your Multi-Account Containers site assignments. Add multiple sites at once with comma-separated input, reassign sites between containers, bulk delete, and import/export rules as JSON for backup or migration.
Requires a native messaging host (Go binary) to read and write MAC's database. See the GitHub repository for installation instructions.
How it works: Multi-Account Containers locks its database while enabled. Temporarily disable MAC via about:addons, make your changes, then re-enable it. The extension detects MAC's status and guides you through this process.
https://github.com/sarcasticbird/fmac-rules-manager
Requires a native messaging host (Go binary) to read and write MAC's database. See the GitHub repository for installation instructions.
How it works: Multi-Account Containers locks its database while enabled. Temporarily disable MAC via about:addons, make your changes, then re-enable it. The extension detects MAC's status and guides you through this process.
https://github.com/sarcasticbird/fmac-rules-manager
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Permissions and data
Required permissions:
- Exchange messages with programs other than Firefox
- Download files and read and modify the browser’s download history
- Monitor extension usage and manage themes
Data collection:
- The developer says this extension doesn't require data collection.
More information
- Add-on Links
- Version
- 0.1.0
- Size
- 16.79 KB
- Last updated
- 5 days ago (May 6, 2026)
- Related Categories
- License
- MIT License
- Version History
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