Are you finding (no pun intended) that Finder is not consistently restoring open windows and tabs when you restart OS X? Here’s a few possible solutions.
Hide your Mac OS X username from the login screen. It’s a simply security measure I recommend for people with laptops especially. Here’s a couple of free and easy ways to do it.
TrueCrypt remains to be the best and more trustable cross-platform disk and file encryption system. Here’s how to get it running on Yosemite and any other version of OS X
Here’s a simple and effective way to block and remove the potentially annoying and obtrusive “annotations” (or overlays) that appear over the top of many Youtube videos. Nice.
Here’s a keyboard shortcut tip for precise keyboard control of screen brightness and audio volume on Mac OS X.