RightTasks places your Google Tasks in a right sidebar in Gmail, like in Google Calendar. This is especially useful if you keep Gmail open and want to see your tasks at all times. You can use all the features available in the official tasks widget, such as:

"Create a task based on the open message", which you can use from the "More > Add to Tasks" menu or with the "SHIFT + T" keyboard shortcut while viewing an email The "G then K" keyboard shortcut, which shifts the cursor from Gmail to Tasks.