Q: What monitors do you use? What computer/laptop do you use? Do you use a mechanical keyboard? How often do you encounter a function/fragment of code that you need to look up/learn
Bug 1695617 - The toolbar library bookmarks panel has scrollbar no matter how shorter it is
HG Web is great to figure out what has happened to removed code
Profile your firefox, visit that site and enable profiler to help figure out why your browser might be slow
Codetribute:
Find a good first bug to start contributing on a Mozilla projects (Firefox, Thunderbird, and more). See the above link for creating a Bugzilla account first!