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Efficient Script Injection for Firefox Users

Simple JavaScript Injector is a powerful tool designed for web developers, enabling them to inject custom JavaScript code into web pages seamlessly. This subscription-based extension adapts the popular Chrome extension 'JS Injector' for Firefox, enhancing the web development experience by allowing users to execute scripts on specified URLs. With an intuitive interface, users can easily manage their scripts and customize their web browsing experience according to their development needs.

Top Recommended Alternative

The extension supports various use cases, from testing and debugging to enhancing functionality on web pages. By providing access to the original source code, developers can modify and tailor the extension to their requirements. Simple JavaScript Injector stands out as a valuable asset for those looking to streamline their web development tasks within the Firefox browser.

App specs

  • License

    Subscription

  • Version

    1.1

  • Latest update

  • Platform

    firefox

  • Size

    71.45 KB

  • Developer

    • Joel Perpetua

Program available in other languages


Download for Mozilla Firefox

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Top extensions for Mozilla Firefox

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Top downloads Web development for Mozilla Firefox

Top downloads Web development for Mozilla Firefox

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Laws concerning the use of this software vary from country to country. We do not encourage or condone the use of this program if it is in violation of these laws.
Softonic

Is Simple JavaScript Injector safe?

100/100

Score result: Clean

This file passed a comprehensive security scan using VirusTotal technology. It is safe to download.

  • Virus free
  • Spyware free
  • Malware free
  • Verified by Security Partners

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Scan Info

Last scan
Sunday, January 11, 2026
Scan provider
VirusTotal · Full report

File Integrity

File
1.1.xpi
SHA256
cb820b89b8e5c330cb8083e67c6b834502a448c69c0c269938e9d770c2ddbec0
SHA1
db9f3b3b0e12ae2b73e3bb14fbbe9219d743d5a5

Softonic security commitment

Simple JavaScript Injector has been thoroughly scanned by our advanced security systems and verified by industry-leading partners. This file comes from the official developer and has passed all our security checks, showing no signs of viruses, malware, or spyware. For more information, visit our Security and Trust Center