I've never gotten along too well with the Mozex plugin that should allow me to edit Firefox textareas in TextMate. Fortunately, a new plugin seems to make things a lot easier...
There are times when you want to connect to the Internet through unknown and/or insecure networks such as the local Panera or other WiFi hotspot. If you aren’t careful, you might make it all too easy for someone to sniff your connection using Ettercap
XPath Checker is a Firefox Extension I wrote for testing XPath expressions interactively. You might find it useful if you use xpaths or want to learn how.