What Are Firefox Multi-Account Containers?
Firefox Multi-Account Containers is a powerful Firefox extension that lets you separate your
browsing into color-coded environments called “containers.” Each container operates independently, with its own
cookies, site data, and login states – like having multiple browsers in one.
Developed by Mozilla, Multi-Account Containers addresses a common problem: we all have multiple online identities.
Work accounts, personal accounts, shopping profiles, and social media each deserve separation. Containers provide
that separation without running multiple browser windows or constantly logging in and out.
Why Use Firefox Containers?
Account Separation Without Hassle
Before containers, managing multiple accounts meant:
- Using different browsers for different accounts
- Constantly logging in and out
- Using private windows (which don’t save passwords)
- Dealing with accidental logins to wrong accounts
Containers solve this elegantly – each container maintains its own login state.
Privacy Benefits
Containers prevent cross-site tracking:
- Cookie isolation: Facebook in one container can’t track your shopping in another
- Login separation: Your Google account doesn’t see what you do in non-Google containers
- Tracking prevention: Ad networks can’t build unified profiles across containers
Organizational Benefits
- Color-coded tabs make it easy to identify which “mode” you’re in
- Sites can automatically open in specific containers
- Work doesn’t mix with personal browsing
- Shopping activities stay separate from social media
Setting Up Firefox Multi-Account Containers
Step 1: Install the Extension
- Open Firefox
- Navigate to addons.mozilla.org
- Search for “Firefox Multi-Account Containers”
- Click Add to Firefox
- Accept the permissions and confirm installation
Alternative: Go to Menu → Add-ons and themes → Search “containers”
Step 2: Understand Default Containers
The extension comes with four pre-configured containers:
- Personal (blue): Personal email, social media, banking
- Work (orange): Work email, professional tools, company apps
- Banking (green): Financial accounts, trading platforms
- Shopping (pink): E-commerce, price comparison, purchases
Step 3: Create Custom Containers
- Click the container icon in the Firefox toolbar
- Select Manage Containers
- Click Add new container
- Choose a name, color, and icon
- Click OK
Suggested custom containers:
- Social Media – Keep Facebook, Twitter, LinkedIn contained
- Google – Contain Google’s tracking to one environment
- Research – Anonymous browsing for research activities
- Client Work – Separate container per major client
Step 4: Open Tabs in Containers
Method 1: Right-click a link
- Right-click any link
- Select Open Link in New Container Tab
- Choose your container
Method 2: Long-press the + button
- Click and hold the new tab (+) button
- Select a container from the dropdown
Method 3: Use the container icon
- Click the extension icon in the toolbar
- Select a container to open a new tab
Step 5: Set Up Automatic Container Assignments
Make sites automatically open in specific containers:
- Click the container icon while on a website
- Select Always open in [container name]
- The site will now automatically open in that container
Recommended auto-assignments:
- facebook.com → Social container
- gmail.com → Work or Personal (depending on account)
- amazon.com → Shopping
- Your bank’s website → Banking
- Company tools → Work
Advanced Container Usage
Using Multiple Accounts on the Same Site
One of containers’ best features – log into Gmail with different accounts:
- Open Personal container → Log into personal Gmail
- Open Work container → Log into work Gmail
- Both stay logged in simultaneously
- Color-coded tabs show which account you’re using
This works for any site: Twitter, LinkedIn, Amazon, etc.
Facebook Container (Special Add-on)
Mozilla offers a dedicated Facebook Container add-on:
- Automatically isolates Facebook in its own container
- Blocks Facebook tracking across other sites
- Prevents Facebook’s “Like” buttons from tracking you
- Works alongside Multi-Account Containers
How Send.win Helps You Master Firefox Multi Account Containers
Send.win makes Firefox Multi Account Containers simple and secure with powerful browser isolation technology:
- Browser Isolation – Every tab runs in a sandboxed environment
- Cloud Sync – Access your sessions from any device
- Multi-Account Management – Manage unlimited accounts safely
- No Installation Required – Works instantly in your browser
- Affordable Pricing – Enterprise features without enterprise costs
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Install from addons.mozilla.org for enhanced Facebook privacy.
Temporary Containers
For maximum privacy, install the Temporary Containers add-on:
- Each new tab opens in a fresh container
- Container (and its data) destroyed when tabs close
- Perfect for research or sensitive browsing
- No cookies persist between sessions
Container Sync (Firefox Sync)
Container configurations sync across devices with Firefox Sync:
- Container names and colors sync automatically
- Site assignments sync across computers
- Works with Firefox accounts
Limitations of Firefox Containers
While powerful, containers have important limitations:
1. Same Browser Fingerprint
The problem: All containers share the same browser fingerprint (Canvas, WebGL, fonts, screen
resolution, etc.)
The impact: Sophisticated tracking can link your containers together. Fingerprinting identifies your
device regardless of which container you use.
The implication: Containers provide cookie isolation, not identity isolation.
2. Same IP Address
The problem: All containers use your same IP address.
The impact: Platforms detecting multiple accounts will still see them coming from the same IP.
3. Firefox-Only Solution
The problem: Containers only work in Firefox.
The impact: Users of Chrome, Edge, or Safari need alternative solutions.
4. Not Designed for Antidetect Use
The problem: Containers weren’t designed to defeat platform detection.
The impact: Using containers to run multiple accounts on platforms like Amazon, eBay, or Facebook
may still result in linked accounts and suspensions.
When Containers Aren’t Enough
For professional multi-account management, containers fall short:
Scenario: E-commerce Seller
You manage 5 Amazon seller accounts. With containers:
- Each account opens in its own container ✓
- But all share the same fingerprint ✗
- All come from the same IP ✗
- Amazon’s detection algorithms link them ✗
- Result: Account suspensions
Scenario: Social Media Manager
You manage 10 client Instagram accounts. With containers:
- Each account has its own cookies ✓
- But Instagram sees identicial browser fingerprints ✗
- Platform flags accounts as connected ✗
- Result: Verification requests or bans
Better Alternative: Antidetect Browsers
For these scenarios, antidetect browsers provide what containers cannot:
- Unique fingerprints: Each profile has different Canvas, WebGL, fonts, etc.
- Proxy integration: Different IP per profile
- Complete isolation: True separation beyond just cookies
- Platform-tested: Designed to pass detection
Send.win offers cloud-based antidetect profiles that work where containers fail. Each profile has a
unique fingerprint, integrated proxy support, and runs in complete isolation in the cloud.
Containers vs. Antidetect Browsers
| Feature | Firefox Containers | Send.win |
|---|---|---|
| Cookie Isolation | ✅ Yes | ✅ Yes |
| Storage Separation | ✅ Yes | ✅ Yes |
| Unique Fingerprints | ❌ No (shared) | ✅ Yes (per profile) |
| IP Separation | ❌ No | ✅ Yes (proxy per profile) |
| Platform Detection | ⚠️ Can be detected | ✅ Designed to pass |
| Price | ✅ Free | 💰 Paid (with free trial) |
| Best For | Personal privacy | Professional multi-account |
Best Practices for Container Usage
Organizing Your Containers
- Keep it simple: 4-6 containers is usually sufficient
- Use meaningful colors: Blue for personal, orange for work, etc.
- Set auto-assignments: Reduce manual work for frequently used sites
- Review periodically: Remove containers you no longer need
Security-Focused Container Strategy
- Banking container: Only for financial sites, never for other activities
- Shopping container: Contains tracking from e-commerce sites
- Social container: Isolates social media’s extensive tracking
- Research container: For sensitive searches you don’t want associated
Work-Life Separation
- Keep work email and tools in Work container
- Personal email and social media in Personal container
- Client-specific containers for different projects
- Never mix – if you accidentally open a work site in personal, close and reopen correctly
Frequently Asked Questions
Can I use containers to run multiple accounts on the same platform?
For basic separation (different logins), yes. For platforms that actively detect multiple accounts (Amazon, Facebook,
eBay), containers alone aren’t sufficient because they share the same fingerprint and IP. Use antidetect browsers
like Send.win for professional multi-account management.
Do containers slow down Firefox?
Minimally. Each container uses memory for its isolated storage, but the impact is negligible for normal usage. Having
many open container tabs uses more memory than regular tabs, but not significantly.
Can websites detect that I’m using containers?
Websites cannot directly detect container usage. However, fingerprinting can identify that the same browser is being
used across containers, potentially linking activities.
Are containers the same as Firefox profiles?
No. Firefox profiles are completely separate browser instances with their own extensions, settings, and bookmarks.
Containers are lighter – they share the browser but isolate cookies and site data. Profiles provide stronger
separation but are more cumbersome to manage.
Will my extensions work in all containers?
Yes, extensions work across all containers. Each container sees the same extensions with the same settings. This is
convenient but means extension data isn’t isolated between containers.
Conclusion
Firefox Multi-Account Containers is an excellent free tool for organizing your browsing and enhancing privacy. For
separating work from personal browsing, containing social media tracking, and managing a few accounts on the same
sites, containers work well.
However, containers have clear limitations for professional multi-account management. The shared fingerprint and IP
address mean platforms can still detect connected accounts. For serious multi-account work – e-commerce, social
media management, advertising – antidetect solutions like Send.win provide the isolation that
containers cannot.
Start with containers for everyday privacy. When you need more, try Send.win’s cloud-based browser profiles with
unique fingerprints, proxy integration, and true separation between identities. Get started with the free trial
today.