Building Browser Extensions: Create Modern Extensions for Chrome, Safari, Firefox, and Edge

© The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2023

M. FrisbieBuilding Browser Extensionshttps://doi.org/10.1007/978-1-4842-8725-5_9

9. Content Scripts

Matt Frisbie¹  

(1)

California, CA, USA

 

Contents scripts are one of the most powerful tools available in browser extensions. They allow you to inject JavaScript and CSS into any web page and modify it with almost no restrictions. The injected content can be as simple as a few visual tweaks, or as complicated as entire single page application frameworks. Extensions can also use them for nonuser interface reasons: content scripts can read and modify the page DOM, as well as send network requests as the authenticated user.

Introduction to Content Scripts

The most ...