How do I create an extension/add-on that will work for both Firefox and Chrome?
Creating an extension that works for both Firefox and Chrome requires the following steps:
1- Choosing a programming language (JavaScript, HTML and CSS)
2- Creating the extension's functionality
3- Creating two manifest files: manifest.json for chrome, manifest.webmanifest for Firefox.
4- Using browser-specific APIs
5- Packaging and distributing the extension on Chrome web store and Firefox Add-ons website.

Note that, using frameworks like WebExtensions API can help you to create a cross-browser extension with a single codebase and make the process easier.
Can you guide me on how to properly implement your approach?