make gitignore file.
make manifest.json file.
make controller.js file.
make putDom.js file.
add putDom.js file to content_scripts list of the manifest.json file.
test function putDom() is working in controller.js file.
add jquery.min.js file to content_scripts list of the manifest.json file.
add functionality to the putDom.js
- insert div dom element to the <body> of html document.