[#1] Navigation Timing API added.
[#1] Information about scripts and its influence on parsing added.
[#1] Adding information about parser workflow.
[#1] Added information about optimizing requests amount.
[#1] Adding new slides to the browser internals chapter.
[#1] Information about requestAnimationFrame added.
[#1] Layout and repaint described.
[#1] Tools chapter is almost finished.
[#1] D8 profiler description added.
[#1] Slides about Firefox finished.
[#1] Tools finished (missing *.gif files with presentation).
[#1] Adding skeleton for demos.
[#1] Further preparation for demo.
[#1] Cleaning up.
[#1] Fixing typos, reviewing notes and markdown files.