Inject Javascript is a Chrome extension developed by quentin.bramas. It falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. This extension allows users to add custom JavaScript to any web page they visit. The main highlight of this extension is its ability to sync the injected scripts across multiple devices.

One of the notable features of Inject Javascript is its open-source nature. The developer has made the extension open source to ensure transparency and to address any potential security concerns. The extension is designed to be small in size, making it easy for users to verify that it does not perform any malicious activities.

Inject Javascript automatically saves and syncs all the scripts that users add. This ensures that users can access their customized scripts on any device they use. Additionally, the extension provides a function called `injectLibs([lib1url, lib2url, ...], callback)` that allows users to inject libraries before executing their custom scripts.

With Inject Javascript, users have the freedom to enhance their browsing experience by adding custom JavaScript to web pages, all while enjoying the convenience of syncing their scripts across devices.