# jsin

> js injector - easy way how to mess with webpages and do a load of funny stuff \>:)

Canonical page: [https://chrome-stats.com/d/jsin](https://chrome-stats.com/d/jsin)

## Overview

- **ID:** `jsin`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Jirka Justra
- **Category:** web-development,appearance
- **Version:** 0.5.0
- **Last updated:** 2022-12-29
- **First published:** 2020-02-20
- **Size:** 20 KB
- **Data as of:** 2026-09-05
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/jsin/)
- **Website:** [https://gitlab.com/jjustra/jsin](https://gitlab.com/jjustra/jsin)

## Description

jsin is a powerful Firefox add-on that allows you to inject JavaScript code into selected webpages. With jsin, you can easily manipulate webpages, perform bonus tasks like downloading files, closing tabs, and sending messages to native apps. Discover the fun side of web browsing with jsin!

## Rankings

- #145,274 — Overall

## Permissions and access

### Permissions

- `activeTab`
- `contextMenus`
- `storage`
- `tabs`
- `webNavigation`
- `unlimitedStorage`
- `nativeMessaging`
- `downloads`
- `<all_urls>`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/jsin)