You should check these extensions out

Also honorable mention for this latest extension:

How to make own extension:

1. Make a new folder for files like:

manifest.json

{
  "manifest_version": 1,

  "name": "Add your extension name™",
  "version": "0.1.0",
  "description": "theme.",

"icons": {
      "128": "icon128.png"
   },

  "content_scripts": [{
    "css": ["styles.css"],
    "js": ["content.js"],
    "matches": ["https://www.is.fi/*"]
  }]
}

Add image with name icon128.png for extension icon

content.js

//add extension javascript here for example:

styles.css

//add styles to your website extension
#header{
display:none;
}

1. Go to chrome://extensions on your browser

2. Enable developer mode

3. In same page add your extension/folder to browser extensions

And you then have made a browser extension

Gz ✨