Mac OS X only: The default behaviour for the Home and End keys on the Mac can be very annoying—particularly for Windows-to-Mac switchers. Freeware application KeyFixer remaps your Home and End keys so they move the keyboard cursor to the beginning or end of a line, duplicating the behaviour of the Home and End keys in Windows. (Cmd-Left/Right arrow perform the same function by default.) We covered a nitty gritty method for accomplishing this once before, but it requires manually editing system files and doesn't actually work for Firefox. Together, the two flavors of KeyFixer will fix the Home/End behaviour both across your system and in Firefox, which means that's one major OS X annoyance you can cross off your list. KeyFixer is freeware, Mac OS X only.
Fix Your Home and End Keys with KeyFixer
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roanokecollege/Flickr Even if they haven't gone so far as to get formal self-defence training, many people (particularly women) have considered what strategies they'd deploy if they were attacked by a stranger. A popular thought is that one would use an object on your person as a weapon of defence - like keys, for instance.