InjectJS – JavaScript Injector & Custom Script Manager
#29,330 of 274,294 by installs on Chrome · #17,933 of 165,072 in productivity
First seen by this census 09/01/2026 — the store does not publish a creation date
Last updated 01/19/2026
Tracked since 09/01/2026
Compare with another extension
Category: productivity / developer
Languages: English
Description
Inject custom JavaScript (JS) into any webpage, automate tasks, and manage scripts. Ideal for developers and power users.
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Growth
Change in installs. This store publishes the count rounded to one or two significant figures, so it does not move when the listing grows - it moves when the rounding rolls over. The figures below are therefore what was actually observed between the two crawls named in "measured over", not scaled to the window, and the percentage is of that same rounding step - so a small listing crossing a bucket shows a very large one. A window needs a full period of history before it reports anything.
| Per | Growth | Growth % | Actual change | Measured over |
|---|---|---|---|---|
| day | 0 | — | 0 | 1.8 days |
| week | Not enough history yet | |||
| month | Not enough history yet | |||
| year | Not enough history yet | |||
History
Users
Ratings
Average rating
Permissions
Access level: Extensive — Reaches every website you visit, and holds a powerful capability as well.
- Reads and changes your data on all websites
- Run user scripts - code that did not ship with the extension - on the pages you visit
Ad blockers, password managers and VPNs need this kind of access to do their job. This describes what the extension can reach, not how it behaves.
Manifest V3
Reads and changes your data on all websites ⚠
- contextMenus — Add items to your right-click menu
- scripting — Run scripts on web pages you visit
- storage — Save its own settings and data locally
- userScripts ⚠ — Run user scripts - code that did not ship with the extension - on the pages you visit
- webNavigation — See what pages you navigate to and when