Extension Development for Browsers (Chrome, Firefox, Opera, Safari)

Web Extensions Examples

GitHub - mdn/webextensions-examples: Example Firefox add-ons created using the WebExtensions API

Comparison Browsers 

Six of the best browsers in direct comparison

Add-ons for Firefox

Manage My Submissions :: Developer Hub :: Add-ons for Firefox

Debugging with Firefox Developer Tools

User interface - Mozilla | MDN

Match patterns - Mozilla | MDN

Promise - JavaScript | MDN

javascript - Как модифицировать URL через chrome.webRequest.onBeforeRequest? - Stack Overflow на русском

Intercept HTTP requests - Mozilla | MDN

Getting started with web-ext - Mozilla | MDN

HTML | DOM Input Radio Object - GeeksforGeeks

Debugging - Runtime / this-firefox

Javascript (Node.js) - How to read and process multiple line provided as an input to a function? - Stack Overflow

No effect cyberfox

For add-on signing the preferences and overrides will have no effect as the code was removed from cyberfox.
For Container Tab you must enable it in the about:config set the following to true
"privacy.userContext.enabled"
"privacy.userContext.ui.enabled"

Save to browser memory

var authCredentials = {
username: "user",
password: "passwd"
}
browser.storage.local.set({authCredentials});

Firefox Development

1. Goto URL: about:debugging#/runtime/this-firefox
2. Click folder load temporary add-on

Add-ons for Chrome