XPLN

JavaScript disabled on this pageThis page require enabled JavaScript to work. If you use any plugin or extension, which blocks it - disable it or add this page to whitelist.If your browser is unable to use JavaScript you will be unable to work.If you are not sure, you can check if your browser have JavaScript disabled or not. For most popular browsers you can check it with steps described bellow:

FireFox - before Fx 23 it was easily possible in Settings (Content tab), where we can disable/enable by simple tick. Versions 23 and higher need add-on to easy access. "SettingsSanity" add-on restore that tab, but there are more add-ons like "No-Script" or "Quickjava", which give us this feature. Or we can do this manually with those steps:

In the address bar, type about:config, and press Enter.
Click "I'll be careful, I promise"
In the search bar, search for javascript.enabled.
Right click the result named javascript.enabled and click Toggle. JavaScript is now disabled or enabled, depends from earlier state

Chrome - open Settings and there click Show advanced settings link at bottom. In Privacy block click Content settings... button. There is JavaScript block where you can disable/enable JavaScript for whole browser or for specific hosts,

IE - select Internet Options from Tools. Then in Security Tab choose Internet and select Custom level. Then locate Scripting and under Active Scripting near bottom of list select Enable or Disable.

Opera - there are two ways to do This. With Settings > Quick configuration as easy way, or Settings > Preferences > Advanced > Content where we can also set more advanced options for JavaScript

Safari - choose Preferences from Edit dropdown and look for Security icon/tab. Tick or untick Enable JavaScript

Those instructions may vary a bit, depends from operating system or browser version you use.