SPOF-O-Matic : Chrome extension for detecting and simulating frontend Single Points Of Failure. Detects likely third-party single points of failure as you browse and...
Dimensions Browser Extension : Measure between the following elements: images, input-fields, buttons, videos, gifs, text, icons. You can measure everything you see in the browser.
Memex : Browser Extension to full-text search your browsing history & bookmarks.
choo : A 4kb framework for creating sturdy frontend applications
The easiest way to measure your performance budget.