Checker Plus for Gmail (Chrome, Firefox, and Edge) allows you to see notifications and read, listen to, or delete emails.

G App Launcher for Chrome and Firefox gives you the option to create a menu that stores all your Google service shortcuts (1000+), allowing fast access to frequently used ones.

Shortcuts for Google is a Chrome extension that allows you to choose from 1000+ Google shortcuts to show up as buttons in a space-saving popup.

Black Menu for Google Chrome, Firefox, and Opera is a free extension enabling you to easily access all the most commonly used Google services.

Boomerang for Gmail allows you to schedule the time when your emails are sent and more.

Google Dictionary for Chrome allows the in-browser search for the meanings of words.

High Contrast for Chrome allows users to invert a web page's color scheme.

Google Input Tools allows you to switch to typing in a different language with the click of the mouse and switch back just as easily.

Save to Google Drive for Chrome allows you to directly save web content or screen captures to Google Drive.

Notifier for Gmail is a browser extension/add-on that notifies you of incoming emails across all your Google Mail accounts and labels, helping you stay on top of your email communication.

Google Translate for Chrome allows you to view translations easily as you browse the web quickly. Also available for Android.

Kanbanly for Chrome provides you with a unique way to Manage your Google tasks to-do list via a visual Kanban board.

Simplify Gmail for Chrome, Firefox, and Edge will strip down your Gmail's interface to only feature the bare necessities.