For all people who use Mozilla Firefox, I have assembled a "Collection" containing the add-ons I can not live without.
The link to this collection is: https://addons.mozilla.org/collections/kealper/kealper
(After installing all 4 add-ons, I recommend going through the configurable options on each, to customize each add-on and further increase the personalizification.)
If you would like an easy, personalized theme for Firefox, you can check out http://getpersonas.com and quickly preview/set all sorts of simple themes.
Off topic: This morning one of my monitors (my touchmonitor) died. RIP oh faithful touchmonitor!