Is Lean Library safe?
Lean Library ships a hardcoded API Bearer token in its source and collects the user's IP address at startup for institution detection.
The extension bundles a static Bearer token in its background script, which is sent with every request to api.leanlibrary.app for logging actions and user feedback. On startup and every 15 minutes, the extension sends the user's IP address to llapi.leanlibrary.com to identify which library institution to associate with the user. Because the token is embedded in the distributed XPI file, anyone who extracts the package can replay authenticated API requests.
Part of this rating comes from analysis signals we haven't published as detailed findings yet.
Who publishes itLean Library - no other listings under this identity, 15 shared hostnames
Lean Library - no other listings under this identity, 15 shared hostnames
What this publisher told the store about itself, and the other listings that told it the same thing.
Shared hosts - 15 hostnames
Hostnames hardcoded in this extension that few other listings call. That can mean one operator behind both, and it can equally mean a small shared vendor, so it is context rather than a conclusion. Hosts that many listings call are left out: they are services, not connections.
AI-generated. Findings may contain errors. Those marked Verified have been manually reviewed.
Publishers can request a review.
What it can do
Permissions this extension asks for, as declared in version 2026.12.1. Asking for a permission is not a finding on its own - it is what the extension can do if it chooses to.
Read and change your data on every site you visit
http://*/* and 1 more
Read and change your data on every secure site you visit
https://*/*
Store data in your browser
storage
See the address and title of every tab you have open
tabs
Schedule its own background tasks
alarms
Act on the current tab, but only after you click the extension
activeTab
See every page you navigate to, as you navigate to it
webNavigation
Add items to the right-click menu
contextMenus
Store an unlimited amount of data in your browser
unlimitedStorage
Where it sends data
Destinations our analysis observed library_access contacting. Sending data somewhere is not a finding on its own - an extension that syncs your settings has to talk to its own server - but it is where your data can go, and who else it goes to.
- api.leanlibrary.app
library_access sends data to api.leanlibrary.app. No other extension we have analyzed sends data here.
- llapi.leanlibrary.com
library_access sends data to llapi.leanlibrary.com. No other extension we have analyzed sends data here.