Hey there! So on the Firefox browser: 1) You click the menu button on the top right hand corner 2) You go down to "Add-ons and themes" (or Command + Shift + A for mac) 3) And the first thing you'll see is Extensions but you don't want that. Go to your left and you should see a button that says themes. 4) Once you've clicked on themes, you can see what themes are enabled and disabled. Currently your screen would say the black theme is enabled. 5) Scroll a little bit down and you'll see the "Light" theme is disabled. 6) Click the "Enable" button to the right side of the theme bar icon and it should change your theme from black to white. Hope I helped! If you still have issues please feel free to reply any problems you're currently facing! Kind regards, Bithiah