My Firefox Add Ons
This is a list for myself as much as anything. So, Peter. The next time that your computer breaks and is wiped clean by IT – then these are the main things that you need.
Delicious Bookmarks – Access your bookmarks wherever you go and keep them organised
Firebug – Web development tool
Fire FTP – An FTP client for Firefox – and a pretty good one at that
Fireshot – For screenshots of entire screens which can be edited and saved as JPEG, GIF, PNG or BMP
Google Toolbar for Firefox – A bunch of Google Tools and the (in)famous green page rank bar
LinkDiagnosis – For examining link competition
NoDoFollow – Highlight links in a document and splits them between follow/do follow
SearchStatus – Displays the Google, Alexa, Compete and Linkscape rankings of a website
YSlow – measuring loading speeds – more important with the advent of Google Caffeine. It also contains Smush.it – a good free tool from Yahoo for optimising web images
And a couple of software packages
Jing – for screenshots
Traffic Travis – for keyword reporting and backlinks
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Image credit: Olaya B

For screenshots, Gyazo is faster (http://gyazo.com/), and Picnik.com also has a Firefox addon that allows for upload of screenshots for editing and annotation online. Jing’s OK – a cut-down version of Snagit, which is better for annotating and editing images afterwards.
For restoring a PC after a wipe I’d start with Ninite (http://ninite.com/) every time, and use the Xmarks Firefox addon to avoid losing any bookmarks.