Ideas and tasks often show up while you are reading something else, and switching to a task app to write them down breaks your flow. A to do list extension puts task capture one click away in the toolbar, so you can save a link or a note as a task before you forget it.
Adding tasks from a webpage
The main advantage of a to do list extension is capturing a task with context attached, such as the page title and link, instead of retyping it later. Look for an extension that lets you set a due date and project right from the popup, so the task lands where you want it without extra steps afterward.
Turning emails and pages into tasks
Todoist's extension can add tasks directly from Gmail and other webmail, attaching the email as a reference so you can act on it later without leaving it unread in your inbox. This works well for delegating follow-ups or turning a long email thread into a single actionable task.
When a simple checklist is enough
If you only need a short running list rather than due dates, projects and reminders, a lightweight checklist or notepad extension may suit you better than a full task manager. Task manager extensions add the most value when you already organize work into projects with deadlines.