Energy Efficiency

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You can enable javascript, select Menu > Settings > Advanced > Site Settings > JavaScript > Toggle the setting to "Allowed".

You can enable javascript by following steps :

Type "about:config" in the address bar, then press "Enter"
Select the "I accept the risk!" button.
Type "javascript" in the "Search" box.
Double-click the "javascript.enabled" line to toggle the setting between "true".

You can enable javascript by following steps :

You can enable javascript by following steps :

Select the Gear in the upper-right corner of the screen or the "Tools" menu if you have the menu bar enabled, then select "Internet Options".
Select the "Security" tab.
Select "Internet" to modify.
Select the "Custom level…" button.
Scroll down to the "Scripting" area and select the radio button to "Enable"
Select "OK", then "OK" again.