Today I start programming a firefox extension.
After some research and tests, I saw this is not a simple issue and I create this first tutorial about Programming extension with Firefox.
I created a folder named myx and I add with two files: manifest.json and myx.js.
The first file named manifest.json has this source code:

The file named myx.js has this source code:

I open the firefox with this URL: about:debugging#/runtime/this-firefox and a load the manifest.json file with Load Temporary Add-on….
Firefox will create a blue border every time when you use google search to search something.
The programming extensions is a complex issue because you need to know advanced programming technics for security: Content Security Policy, X-Frame-Options, Cross-Site Scripting (XSS) and more.

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