Firefox Multi-Account Containers is a built-in Firefox feature that separates browser sessions into isolated containers. Each container has its own cookies, storage, and login state.
Tab Manager and Session Saver for Firefox solves a different problem: saving and restoring named sets of tabs across sessions.
They are not competing tools — they solve different problems. Here is when to use each.
Firefox Multi-Account Containers
What it does:
- Isolates cookies and sessions by container
- Each container is a separate "identity" in the browser
- Example: one container for work Gmail, one for personal Gmail — both logged in simultaneously
- Tabs are color-coded by container
Primary use case: running multiple accounts for the same service simultaneously without logout/login cycles.
Who created it: Mozilla. It is a first-party Firefox extension.
Limitations:
- Does not save sessions (tabs disappear on browser close)
- Not about organizing tabs — about isolating identities
Tab Manager and Session Saver
What it does:
- Save a named snapshot of your current tabs
- Restore that snapshot later (re-opens all saved tabs)
- Organize sessions by name: "Client A research", "Project roadmap", "Weekend reading"
Primary use case: context switching between different work streams without keeping all tabs open simultaneously.
Who created it: Third-party Firefox extension (not Mozilla).
Limitations:
- Sessions are stored locally, not synced across devices
- Does not isolate cookies — purely about tab organization
Which to use
| Need | Tool |
|---|---|
| Multiple accounts for same service | Multi-Account Containers |
| Saving and restoring tab sets | Tab Manager |
| Both | Both, they don't conflict |
If you need to stay logged into two Google accounts simultaneously, Containers is the right tool. If you want to close your 10 research tabs and restore them later as a named session, Tab Manager is the right tool.
They address orthogonal problems. Many power users use both.
Tab Manager and Session Saver — Firefox Add-ons
Tab Manager is one of 11 Firefox extensions I built — see the full series.
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