" Firefox3 Rotor ActivityIndicator (Throbber)"

First of all go to the chrome folder

always move inhere the 2 images FIREfox3 19.png + FIREfox3 rotor.gif 

now have a look inside the same folder
there are 2 possibilities (don't care about any file not exactly named : userChrome.css)

I) < you don't find any "userChrome.css" file in the chrome folder >
in this case close the present file and move the other one: userChrome.css directly with the images in the same folder (chrome < profile< Data< MozillaFirefox)

II) < the "userChrome.css" file is already in the chrome folder >
only in this case continue with the following instructions ...
open the file "userChrome.css" + add (copy and paste + close + save with the same name: userChrome.css) 
all the lines below:

/*/*  Firefox3 Rotor ActivityIndicator  */
#navigator-throbber[busy="true"],
toolbar[iconsize="small"] #navigator-throbber[busy="true"],
toolbar[mode="text"] #navigator-throbber[busy="true"],
.tabbrowser-tab[busy] > .tab-icon-image,
.alltabs-item[busy] > .menu-iconic-left > .menu-iconic-icon,
#sidebar-throbber[loading="true"],
#checkForUpdates[loading="true"],
#extensionsManager richlistitem[loading="true"] .updateBadge,
#extensionsManager .addonThrobber,
#extensionsManager .throbber
{list-style-image: url("FIREfox3 rotor.gif") !important;
    opacity: 1.0 !important;}
#navigator-throbber,
toolbar[iconsize="small"] #navigator-throbber,
toolbar[mode="text"]      #navigator-throbber
{list-style-image: url("FIREfox3 19.png") !important;
    opacity: 1.0;}


