Facebook tutorial #1 - Getting the Old Facebook chat back.
Mozilla Firefox :
First of all you need to install Grease Monkey addon in firefox in order to install the required script. To install grease monkey simply visit the Grease Monkey Add-on webpage and click on add to firefox.
After you click on add to firefox button you will get an popup for installing grease monkey. Click install and after installing grease monkey restart firefox.
Now after you have installed Grease Monkey Addon visit the Facebook Chat Reversion script webpage and click install button present on the top right corner.
Now you will get a popup for installing the script, click install button and the script will be installed.
After installing the script just refresh the facebook page in order to see the changes. Now your old facebook chat with scroll bar will be back. If you are not getting the old facebook chat after following the above steps simply empty the cache and then refresh the page.
Google Chrome :
You can directly install the script. Visit the Facebook Chat Reversion script webpage and click install.
Then you will get a message in lower left corner of your browser asking you click continue.
After that you will get a popup to install the script, click install and script will be installed.
After installing the script just refresh the facebook page in order to see the changes. Now your old facebook chat with scroll bar will be back. If you are not getting the old facebook chat after following the above steps simply empty the cache and then refresh the page.
Opera
If you are using Opera then you will have to enable User Javascripts first.
For Mac, go to: O menu > Preferences > Advanced > Content > JavaScript options
For UNIX and Windows, go to: O menu > Settings > Preferences > Advanced > Content > JavaScript options
Click on choose, and choose a directory where you will save your scripts.
For e.g. , you can open "My Documents" , then create a folder named "Opera JavaScripts", and store your JavaScript files in here, and for the step above choose this folder.
Now open the Facebook Chat Reversion script webpage and right click the install button on the top right corner and click on "Save linked content as" and select the folder you chose in the step above.
Restart Opera and you should be done.
If you're facing problems, such as the old chat not coming back on https://www.facebook.com (secure) or not coming at all then, type in "opera:config" in the address bar and a page will load. In the bar (on the page not the address bar) type in "User Javascripts", and a few options will come. Tick all of them. Click on save, and restart opera. It should work now.
If you have any problems, you can post below.
Edit - Added Opera.