Memory leak when opening many tabs

[deanpress]

Expected Behavior

Opening many tabs (especially on the New Tab page) shouldn't use too much computing resources.

Current Behavior

Opening many tabs will cause a decent laptop to hang or freeze completely.

Steps to Reproduce

1. Open nOS Client
2. Spam "New Tab" button until machine slows down

Possible Solution

Cache the "new tab" page instead of rendering a separate view for each new tab.