Is Tampermonkey safe?
Tampermonkey sends anonymous usage analytics, including a persistent UUID and userscript events, to its own servers.
On startup, Tampermonkey transmits a GET request to a.tampermonkey.net containing a persistent visitor UUID, screen resolution, visit timestamps, and the current page URL. When userscripts are installed, updated, or removed, additional events carrying the script name and namespace are sent. Analytics are disabled in incognito mode, and on first run the user is prompted to enable or disable statistics collection.
Who publishes itJan Biniok - 2 other listings from the same operator, none carrying a finding
Jan Biniok - 2 other listings from the same operator, none carrying a finding
What this publisher told the store about itself, and the other listings that told it the same thing.
Same store account
2 other listings published from this account, 710k+ users between them, none of them carrying a finding.
Shared hosts - 3 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 5.4.1. 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
<all_urls>
Read and change your data on favicon
chrome://favicon/
Show you desktop notifications
notifications
Store an unlimited amount of data in your browser
unlimitedStorage
See the address and title of every tab you have open
tabs
Detect when you step away from your computer
idle
See every page you navigate to, as you navigate to it
webNavigation
Watch every request your browser makes
webRequest
Watch, block and rewrite every request your browser makes
webRequestBlocking
Store data in your browser
storage
Add items to the right-click menu
contextMenus
Write to your clipboard
clipboardWrite
Read and change cookies, including the ones that keep you signed in
cookies
Schedule its own background tasks
alarms
Run its own code inside the pages you visit
scripting
Run hidden pages in the background
offscreen
Where it sends data
Destinations our analysis observed Tampermonkey 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.
- a.tampermonkey.net
Tampermonkey sends data to a.tampermonkey.net. 3 other extensions we have analysed send data here.