We often find that a person uses at least half a dozen tools in their day-to-day work. People keep tabs open as to-dos or grouped by different projects.
To decrease a cluttered browser and focus on the most important task at hand, instead of adding a ‘page’ in Coda, you can add any embeddable link into Coda as a page or subpage (<> New embed). Think of the left side panel as your new organizable browser tab. Check out this