I have a few firefox browser add-ons and widgets that I use when trading or surfing the net which may be useful to some. Some are very useful in day to day tasks. All of them are free and some you can upgrade for small fee.
Foxclocks - World clocks that fit onto the bottom of your browser.
Simple Time - Alarm, countdown timer, clock that fits onto the bottom of your browser.
Qlock - World clocks that sit on your desktop.
Xnote Stopwatch - Countdown timer, stopwatch that sits on your desktop. I use this for counting down to candle closes.
Adblock plus - Gets rid of advertising banners on your webpages.
Video Download helper - Firefox add-on that lets you download multimedia that is on your webpage. Good for videos.
Most are fairly customisable. Heres what some of them look like.