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Source code :
Theme fund: NGI Zero Core
Start: 2023-06
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Services + Applications


Proxy-based external browser extensions

Exter is a web based plugin platform which allows addons to alter websites behavior/style/functionality. Instead of trusting the browsers' plugin ecosystem, let's modify the websites before browsers receive them! The goal of this project is to provide a stable and free website-extension-platform to allow future proof and flexible addon development.

As a web application, Exter opens URLs, rewrites the static content and injects client scripts to wrap default javascript functions, applies addons, then sends the sanitized/modified website to the browser. This way we have the ability to write plugins that can intercept/modify not only HTTP requests, but even client side functionalities, such as sanitizing 3rd party content or appending new DOM elements to the website or altering cookie handling from javascript and much more.

Logo NLnet: abstract logo of four people seen from above Logo NGI Zero: letterlogo shaped like a tag

This project was funded through the NGI0 Core Fund, a fund established by NLnet with financial support from the European Commission's Next Generation Internet programme, under the aegis of DG Communications Networks, Content and Technology under grant agreement No 101092990.