I’ve released 2 scripts which aren’t amazing but they’re the start of what can be really useful.

They can be found:- http://www.kaivong.com/scripts/

The first is a css diagnostic trick which looks if images are missing alt tags, inline styling is present and so fourth.  I recommend you use this with Stylish (a Firefox plugin), but you’ll have to tweak it a bit to do that.

Second off is a javaScript domain look up aid.  It simply looks what domain you’re at and then spits it into the top of the rendered page.  When you click it, it disappears.  The colour could be nicer… but it’s just to grab your eye for the time being.  You could use this with GreaseMonkey if you wanna be really cool!