By default, this is how Figma is going to look on your browser.
Step 1: Open a new tab and search for ‘Dark Reader Extension for Chrome’ and on the first link you should be able to find it. Just go ahead and add it to chrome.
Step 2: Now go back to Figma tab, choose the extension and simply turn it on as shown below.
Step 3: Finally, all you need to do is just change the background color of the canvas to a darker color as shown below.
That’s it, here is the before and after version of the Figma App on a browser.
Here is a quick video tutorial of the same: