I am happy with the inspect element feature available on Google Chrome and Firefox. However, I need a bit more helpful browser extensions that can help troubleshoot my web code. Can you recommend the best (free of course) web developer extension helpful for a web developer?

I am developing a responsive theme for my company website. It already has a desktop version. They assigned me the task of creating a mobile version of the same website. I wonder whether I add all content from the desktop theme to my mobile theme. Do you keep all data (text and images) of the desktop...

I am new to the Search Engine Optimization industry. I know today's websites keep desktop and mobile versions. My question is about Google's priority in indexing both website versions.

Which version of a website is cached by Google?