Add browser extension

README.md

@@ -27,6 +27,7 @@ Be sure to read [How To Contribute](CONTRIBUTING.MD)
 - [Git](#git)
 - [React](#react)
 - [Vue](#vue)
+- [Browser extensions](#browser-extensions)
 - [Icons](#icons)
 - [Fonts and Typography](#fonts-and-typography)
 - [Illustrations](#illustrations)
@@ -514,6 +515,15 @@ Be sure to read [How To Contribute](CONTRIBUTING.MD)
 
 [👆 Back To Top](#table-of-contents)
 
+# Browser extensions
+
+- [Check Browsers Support 💵](https://checkbrowsers.support/) - Check browser compatibility without leaving your tab
+- [CSS Inspector 💵](https://cssinspector.com/) - Get the CSS code of any web element with CSS Inspector
+- [CSS Scan 💵](https://getcssscan.com/) - The fastest and easiest way to check, copy and edit CSS
+- [CSS Spider](https://cssspider.fresalabs.com/) - The quickest and convenient way to copy, visualize, edit and export CSS
+
+[👆 Back To Top](#table-of-contents)
+
 # Icons
 
 - [Font Awesome](https://fontawesome.com/?from=io)