The userScripts permission
An extension holding userScripts can
run scripts of its own choosing inside pages, including code fetched after installation.
We weight it 22 out of 100 when scoring how much an extension can reach. That is a measure of capability, not of behaviour: plenty of extensions need this to do their job.
- Extensions we track using it
- 53
- Share of those we have checked
- 0.1%
- Risk weight
- 22/100
Who asks for it
Out of the 67,225 extensions we have examined, 53 declare this permission. These are the largest of them by user count.
| Extension | Platform | Users | Reach |
|---|---|---|---|
| uBlock Origin Lite | Manifest V3 | 18M | 62 |
| Tampermonkey | Manifest V3 | 12M | 100 |
| Sider: Chat with all AI: GPT-5, Claude, DeepSeek, Gemini, Grok | Manifest V3 | 5M | 97 |
| Ghostery AdBlocker for Privacy | Manifest V3 | 2M | 100 |
| AdBlocker Ultimate | Manifest V3 | 2M | 100 |
| OrangeMonkey | Manifest V3 | 1M | 100 |
| Ace Script | Manifest V3 | 1M | 100 |
| PreMiD | Manifest V3 | 400k | 67 |
| Surfingkeys | Manifest V3 | 30k | 100 |
| 极光Tab-划时代的新标签页 | Manifest V3 | 20k | 97 |
| Ultimate 432Hz Converter : Spotify YouTube Tidal & All Web Music Streaming | Manifest V3 | 10k | 100 |
| Gene — AI Assistant & Smart Search | Manifest V3 | 10k | 96 |
| PageExpand | Manifest V3 | 10k | 49 |
| 凌风TEMU工具箱 | Manifest V3 | 10k | 100 |
| Optimizely Assistant | Manifest V3 | 6k | 100 |
| Cesturefy: Navigate, operate, and browse faster with mouse gestures | Manifest V3 | 6k | 52 |
| Inject JS - Run JavaScript code | Manifest V3 | 2k | 62 |
| Kameleoon Debug Assistant | Manifest V3 | 2k | 67 |
| ScriptRunner - v3 userScript manager | Manifest V3 | 1k | 32 |
| Ease Bookmarks mv3 | Manifest V3 | 928 | 32 |
| Auto Clicker - Form Helper | Manifest V3 | 671 | 67 |
| Нарешалка UA | Manifest V3 | 317 | 79 |
| 太联信息驿站 | Manifest V3 | 289 | 97 |
| Moxby | Manifest V3 | 218 | 100 |
| Anywhere | Manifest V3 | 150 | 100 |
Counts are of extensions we have checked ourselves, not of the whole Chrome Web Store. Chrome's own reference for developers: developer.chrome.com. How we weight permissions