Is NotebookLM Extension (Gemini Notebook) - ExtendLM Safe? — Extension Safety Profile
Quick verdict: NotebookLM Extension (Gemini Notebook) - ExtendLM earns a safety grade A, 81.9 out of 100, based on 5 of 5 dimensions.
81.9/100
Grade A · 5 of 5 checks
What we found
Automated safety profile from public signals (the extension's manifest & permissions, store listing, publisher, privacy policy). A full review hasn't been published yet.
What this safety grade means
NotebookLM Extension (Gemini Notebook) - ExtendLM earns a safety grade of A (81.9/100), measured across 5 of 5 dimensions. Its strongest area is Maintenance & Ownership (100%). The weakest is Publisher & Identity (60%) — what holds its grade back the most.
On the public records we can check, NotebookLM Extension (Gemini Notebook) - ExtendLM comes through cleanly. 60,000 active users/installs reported on the store. Store rating 4.9/5 from 134 user ratings. Last updated on the store 2026-10-17. This is an automated profile, not a hands-on review — so treat the grade as a starting point: open NotebookLM Extension (Gemini Notebook) - ExtendLM's own store listing and privacy policy before installing, and weigh it against the other browser extensions we track below.
Safety Signals
Based on 5 of 5 safety dimensions
| Dimension | Score | Bar | Source |
|---|---|---|---|
| Publisher & Identity | 60% · 4.8/8 pts 2 of 5 checks verified | Automated signals | |
| Permissions & Access | 72% · 17.9/25 pts 3 of 3 checks verified | Automated signals | |
| Data & Privacy | 100% · 16/16 pts 4 of 5 checks verified | Automated signals | |
| Maintenance & Ownership | 100% · 7.5/7.5 pts 1 of 2 checks verified | Automated signals | |
| Community Reputation | 83% · 8.3/10 pts 2 of 4 checks verified | Automated signals |
In-depth safety analysis
This extension requests broad permissions that go beyond simple page reading. The "scripting" and "debugger" permissions combined with host access to Google’s notebook and Gemini sites mean it can read and modify content on those pages, as well as intercept and inspect network traffic. While "tabs" and "activeTab" are common for interacting with browser tabs, the "debugger" permission is particularly powerful and less common in general-purpose extensions, giving it high-level control over those specific web pages.
For extensions that augment Google's productivity tools, a user should know that granting access to Google account pages and AI interfaces involves implicit trust. The extension could technically interact with your logged-in sessions on those specific sites. The publisher is responsible for ensuring that any data read from these pages is handled according to their declared privacy policy, which states your data is not sold or used for unrelated purposes.
Our fact sheet shows this extension's strongest dimension is Maintenance & Ownership, reflecting a recent update and active development, which is a positive sign for ongoing security patches. Its weakest dimension is Publisher & Identity, suggesting the developer's public footprint or verifiable details are not as robust as other aspects, meaning a careful user might want to look for more established corporate transparency before installation.
AI-assisted analysis of the documented signals above (permissions, store data, privacy practices) — explains what they mean and the risks typical for this category. Not a hands-on test.
What the store listing shows
Who's Behind NotebookLM Extension (Gemini Notebook) - ExtendLM?
- Publisher extendlm.com
Public records identify the publisher, but no individual founders or a separate registered company are named — which is what holds the Publisher & Identity score back. Less public information about who operates an extension means less you can verify about their long-term accountability.
How it compares
Among the 838 browser extensions we track, NotebookLM Extension (Gemini Notebook) - ExtendLM scores higher on safety than 70% of them.
Computed from our own database of assessed browser extensions — updated as we track more.
Evidence on File (12)
NotebookLM Extension (Gemini Notebook) - ExtendLM FAQ
- Is NotebookLM Extension (Gemini Notebook) - ExtendLM safe?
- NotebookLM Extension (Gemini Notebook) - ExtendLM earns a safety grade of A (81.9/100) on our evidence-based assessment, based on 5 of 5 safety dimensions we could verify from public records. This is an automated profile built from public records, not a hands-on review.
- Who is behind NotebookLM Extension (Gemini Notebook) - ExtendLM?
- NotebookLM Extension (Gemini Notebook) - ExtendLM is operated by extendlm.com.
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