semicolon keyCode

When you press semicolon on Firefox and poke in the event object for its key code, the result is 59. The funny thing is, other browsers give you 186. So, if you want to execute some action when user presses semicolon, you have to check for both values.

if (event.keyCode == 186 || event.keyCode == 59) {
   // some stuff
}

Developers often choose to use semicolon in conjunction with CTRL or ALT keys to issue commands to application in a normal "desktop way". For example, CTRL+; activates other keyboard shortcuts in FogBugz. If you are a clean code maniac (as I am), the alternative for semicolon is ' (an apostrophe), which has a nice key code of 222.