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Gmail Users: Urgent Self-Check — These Extensions Are Stealing Emails (Removal Guide)
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2026-03-25 04:10
Recently, incidents of browser extensions stealing Gmail email content have been occurring frequently. Many users have had their emails read or even leaked without any awareness.
To be honest, this issue isn’t new, but many people still don’t take browser extension security seriously enough.
If you usually install various productivity tools, translation extensions, or email assistants, it’s highly recommended that you read this article carefully and take a moment to do a thorough self-check.
1. Why do browser extensions become “invisible data thieves”?
Many people assume extensions are just small tools to enhance functionality, but in reality, they often have very high-level permissions, such as:
• Reading and modifying data on websites you visit
• Accessing your Gmail content
• Monitoring input on web pages
Once an extension is maliciously exploited—or if the developer itself has bad intentions—your emails, attachments, and even login credentials may be uploaded to third-party servers.
That’s why more and more security experts emphasize: protecting against extension risks is even more important than installing antivirus software.
2. What are the common signs of “email-stealing extensions”?
⚠️ Disclaimer:
Many of the names listed below have appeared in security reports or malicious campaigns. This does NOT mean the official versions are 100% malicious (they could be fake clones, impersonations, or hijacked versions).
When checking your extensions, focus on permissions and source credibility—not just the name.
| No. | Extension Name Example | Risk / Behavior | Risk Description |
|---|---|---|---|
| 1 | AI Sidebar | Data theft | Fake AI assistant extracting emails and browsing data via full-screen iframe. |
| 2 | AI Assistant | Data theft | Fake AI extension that may steal mailbox content after installation. |
| 3 | ChatGPT Translate | Data leakage | Used as a malicious channel to capture page text, including email content. |
| 4 | Gemini AI Sidebar | Malicious activity | Similar to AI Sidebar, potentially steals sensitive data. |
| 5 | Chrome with GPT-5, Claude Sonnet | Session/data leakage | Impersonates multi-model assistants and steals chat data and tab URLs. |
| 6 | Fake AI Chatbot Extension A | Deception / Data collection | Imitates AI chat tools to collect API keys and session data. |
| 7 | Fake AI Chatbot Extension B | Deception / Data collection | Same category targeting email and conversation data. |
| 8 | Fake Productivity AI Extension C | Malicious backdoor | Disguised as office tools but may contain hidden malicious code. |
| 9 | Fake Translation Plugin X | Hidden monitoring | Requests excessive permissions and may leak browsing data. |
| 10 | Fake VPN Extension Y | Credential interception | May intercept login credentials. |
| 11 | Fake VPN Extension Z | Credential interception | Another clone in the same category. |
| 12 | AI Productivity Helper | Suspicious permissions | Pretends to improve email efficiency but requests excessive access. |
| 13 | Mail Enhancer (fake version) | Email access | May spy on Gmail content despite its name. |
| 14 | Browser Speed Tool (fake) | Credential theft | Reported to potentially steal login data. |
| 15 | Emoji Keyboard (hijacked version) | Malicious script injection | Originally harmless, but injected with malicious code after developer account compromise. |
Although lists of problematic extensions keep changing, they usually share some common traits:
• Excessive permissions: e.g., a weather extension asking to read all website data.
• Frequent updates with vague notes: may secretly introduce data collection code.
• Suspicious reviews: repetitive or low-quality comments suggesting fake ratings.
3. Must-do for Gmail users: Extension security check steps
Here’s the key part—how to quickly perform a browser extension audit. It’s recommended to do this right now.
Step 1: Clean up your extensions
• Unknown extensions → remove immediately
• Unused extensions → uninstall
• Duplicate functionality → keep only one
Rule: the fewer extensions, the better.
Step 2: Check permissions
• Does it have “read and change site data” access?
• Can it access “mail.google.com”?
If yes, ask yourself: is this really necessary?
Step 3: Use browser fingerprint analysis
Even if an extension doesn’t directly steal data, it may collect behavioral data via fingerprinting, such as:
• Device information
• Browsing habits
• Login status
When combined, this data becomes highly valuable. It’s recommended to use ToDetect.
It helps you check what fingerprint data your browser exposes and detect suspicious behavior.
4. How to protect yourself browser extension security (practical tips)
1. Install only from official sources
Use the Chrome Web Store and avoid third-party downloads.
2. Perform regular checks
Spend 5 minutes monthly reviewing your extensions.
3. Limit the number of extensions
More extensions = higher risk.
4. Separate accounts
Use different browser profiles for work and personal Gmail accounts.
5. Monitor with fingerprint tools
Regularly check for abnormal browser environment changes.
Final thoughts
Extensions themselves are not the problem—the issue is “overtrust.”
Many Gmail data leaks happen through these “legitimate entry points.”
Prevention is always easier than recovery. Manage your extensions wisely to keep your Gmail safe.
Try ToDetect—it helps visualize your browser exposure and quickly identify risks, making your data more secure and controllable.
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