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Install for Firefox

First step, you will need to download Greasemonkey from here
After you installed Greasemonkey and restarted Firefox, download the script from here.
You will be promopted for the installation, after you click install you are done!
Now you are ready to use it

Install for Opera

Go to 'Preferences' (CTRL+F12) > Advanced > Content > Javascript Options
Choose your 'User Javascript folder', somewhere nice
Right click here > 'Save Content Link As'
Put it in your special nice javascript folder you just made and you are done. :)

Install for Chrome

Install Tampermonkey
Create a new script like these:

Install for Safari

Install NinjaKit and restart Safari
Then click here

Install for IE

Go download Firefox
Read Install for Firefox ;)