Salesforce Lightning Inspector is a developer friendly Google chrome extention, which helps salesforce developers to see the component, Salesforce App performance, Transactions, event log, Actions, and Storage.
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Follow the below steps to install the Salesforce Lightning Inspector in your Google Chrome web browser.
Step 1) Open this url https://chrome.google.com/webstore
Step 2) Type the “Salesforce Lightning Inspector” in the search textbox.
Step 3) Click on the “+ ADD TO CHROME” button and wait for 1-2 minutes to install it.
Step 4) After installation done, hit the F12 to load a new “Lightning” tab in the dev tools. In a simple example below you can see for example how many total components were loaded.